| Reference number | Title | Date |
| MS/787/1/1 | Letter from W[illiam] K[itchen] Parker, Bessborough Street, to H[enry] B[owman] Brady | 5 May 1860 |
| NLB/2/640 | Copy letter from Herbert Rix, to Professor [William Kitchen] Parker, [Fellow of the Royal Society] | 1 October 1888 |
| NLB/2/602 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 25 September 1888 |
| NLB/2/756 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 30 October 1888 |
| NLB/4/252 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, University College Cardiff | 27 March 1890 |
| NLB/2/275 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 23 March 1888 |
| NLB/4/442 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 31 May 1890 |
| NLB/3/727 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 24 September 1889 |
| NLB/3/399 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 1 June 1889 |
| NLB/3/553 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 10 July 1889 |
| NLB/3/510 | Copy letter from Herbert Rix, to William Kitchen Parker, Fellow of Royal Society | 28 June 1889 |
| NLB/3/715 | Copy letter from Herbert Rix, to Professor William Kitchen Parker, Fellow of the Royal Society | 24 September 1889 |
| NLB/7/320 | Copy letter from Herbert Rix, to Professor Thomas Jeffery Parker, Fellow of the Royal Society, care of Reverend F G M Powell, the Parsonage Dalkeith, N.B. | 20 January 1893 |
| NLB/10/1055 | Copy letter from Herbert Rix, to Professor William Newton Parker, Crowland, Cardiff | 1 April 1895 |
| MC/11/352 | Letter from Jas [James] Budgett, Ealing Park, Middlesex, to Jno [John] Evans, Treasurer of the Royal Society | 1 May 1879 |
| RR/7/130 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull of the common frog' by William Kitchen Parker | 31 January 1871 |
| RR/5/172 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in the ostrich tribe' by William Kitchen Parker | 25 October 1865 |
| RR/6/216 | Referee's report by George Murray Humphry, on a paper 'On the structure and development of the skull of the common fowl (Gallus domesticus)' by William Kitchen Parker | 19 May 1869 |
| RR/7/80 | Referee's report by William Kitchen Parker, on a paper 'On the formation of some of the subaxial arches in man' by George William Callender | 30 June 1871 |
| RR/7/262 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in the pig (sus scrofa)' by William Kitchen Parker | 14 July 1873 |
| RR/7/131 | Referee's report by Peter Martin Duncan, on a paper 'On the structure and development of the skull of the common frog' by William Kitchen Parker | 24 February 1871 |
| RR/8/248 | Second letter from William Kitchen Parker, to George Gabriel Stokes, regarding a paper [attributed] 'On the structure and development of the skull in sturgeons (Acipenser ruthenus and A. sturio)' by William Kitchen Parker | 30 July 1880 |
| RR/8/334 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in sturgeons (Acipenser ruthenus and A. sturio)' by William Kitchen Parker | 22 July 1881 |
| RR/9/299 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in the mammalia.— Part II. Edentata' by William Kitchen Parker | 20 March 1885 |
| RR/6/215 | Referee's report by Thomas Henry Huxley, on a paper 'On the structure and development of the skull of the common fowl (Gallus domesticus)' by William Kitchen Parker | 28 April 1869 |
| RR/9/122 | Referee's report by William Kitchen Parker, on a paper 'Researches on the foraminifera - supplemental memoir. On an abyssal type of the genus orbitolites - a study in the theory of descent' by William Benjamin Carpenter | 28 June 1883 |
| RR/7/192 | Referee's report by Thomas Henry Huxley, on a paper 'On the structure and development of the skull in the salmon' by William Kitchen Parker | 31 October 1872 |
| RR/9/81 | Referee's report by William Henry Flower, on a paper 'On the development of the skull in lepidosteus osseus' by William Kitchen Parker | 18 February 1882 |
| MS/427/73 | Copy letter from [Thomas Henry] Huxley, Secretary of the Royal Society; to Miss H. E. Pipe | 16 December 1880 |
| MS/427/435 | Note of a letter from [George Gabriel] Stokes, Secretary of the Royal Society; to the Secretary of the Treasury | 25 June 1885 |
| EC/1865/15 | Parker, William Kitchen: certificate of election to the Royal Society | |
| NLB/1/727 | Copy letter from George Gabriel Stokes, John Evans, Michael Foster, and Lord Rayleigh [John William Strutt], to the Marquess of Salisbury, Robert Gascoyne-Cecil | 17 November 1887 |
| NLB/2/665 | Copy letter from Herbert Rix, to Professor [William Kitchen] Parker, [Fellow of the Royal Society] | 6 October 1888 |
| RR/7/193 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in the salmon' by William Kitchen Parker | 2 December 1872 |
| RR/8/130 | Referee's report by George Busk, on a paper 'On the structure and development the skull in the common snake (Tropidonotus natrix)' by William Kitchen Parker | 12 February 1878 |
| RR/10/67 | Referee's report by Thomas Henry Huxley, on a paper 'On the morphology of birds' by William Kitchen Parker | 15 March 1887 |
| AP/64/12 | Unpublished paper, 'On the morphology of birds' by W K [William Kitchen] Parker | 1887 |
| NLB/11/97 | Copy letter from Herbert Rix, to Dr John Murray, 32 Palmerston Place, Edinburgh | 12 April 1895 |
| RR/9/297 | Referee's report by Henry Nottidge Moseley, on a paper 'On the structure and development of the skull in the mammalia.— Part II. Edentata' by William Kitchen Parker | 6 December 1884 |
| IM/000587 | Group lithograph of Royal Microscopical Society Presidents | nd |
| PT/72/5/5 | Plate, 'North-Atlantic foraminifera' by G West | [1864] |
| RR/7/393 | Referee's report by William Henry Flower, on a paper 'On the structure and development of the skull in the batrachia. Part II' by William Kitchen Parker | 30 November 1875 |
| PT/72/5/1 | Manuscript, 'On some foraminifera from the North Atlantic and Arctic Oceans, including Davis's Straits and Baffin's Bay' by W [William] Kitchen Parker and T [Thomas] Rupert Jones | [1864] |
| PT/72/5/3 | Plate, 'Arctic foraminifera' by G West | [1864] |
| PT/72/5/7 | Plate, 'Arctic foraminifera' by G West | [1864] |
| PT/72/5/8 | Plate, 'Arctic foraminifera' by G West | [1864] |
| PT/72/5/10 | Plate, 'Foraminifera of the North Atlantic' by G West | [1864] |
| MC/7/369 | Letter from W K [William Kitchen] Parker, 18 Bessborough Street, to Dr [William] Sharpey, Secretary of the Royal Society | 5 November 1866 |
| MC/7 | Volume 7 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1864-1866 |
| PT/72/5/9 | Plate, 'Arctic foraminifera' by G West | [1864] |
| RR/5/171 | Referee's report by George Busk, on a paper 'On some foraminifera from the North Atlantic and Arctic Oceans, including Davis Straits and Baffin's Bay' by William Kitchen Parker and Thomas Rupert Jones | 10 February 1865 |
| RR/8/249 | Letter from Thomas Henry Huxley, to George Gabriel Stokes, regarding a paper [attributed] 'On the structure and development of the skull in sturgeons (Acipenser ruthenus and A. sturio)' by William Kitchen Parker | 30 July 1880 |
| PT/72/5 | Paper, 'On some foraminifera from the North Atlantic and Arctic Oceans, including Davis's Straits and Baffin's Bay' by W [William] Kitchen Parker and T [Thomas] Rupert Jones | [1864] |
| PT/72/5/2 | Plate, 'Arctic foraminifera' by G West | [1864] |
| PT/72/5/4 | Plate, 'Arctic foraminifera' by G West | [1864] |
| PT/72/5/6 | Plate, 'North-Atlantic foraminifera' by G West | [1864] |
| PT/72/5/11 | Plate, 'Foraminifera of the North Atlantic' by G West | [1864] |
| MC/11/358 | Letter from W K [William Kitchen] Parker, 36 Claverton Street, to Jno [John] Evans, Treasurer of the Royal Society | 12 May 1879 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| MC/12/131 | Letter from Hannah E [Elizabeth] Pipe, Laleham, Clarence Road, Clapham Park, to the Royal Society | 9 December 1880 |
| MC/12 | Volume 12 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1880-1883 |
| RR/6/45 | Referee's report by William Kitchen Parker, on a paper 'Description of Parkeria and Loftusia, two gigantic types of arenaceous foraminifera' by William Benjamin Carpenter and Henry Bowman Brady | 13 July 1869 |
| RR/9/298 | Letter from Henry Nottidge Moseley, on a paper 'On the structure and development of the skull in the mammalia.— Part II. Edentata' by William Kitchen Parker to the Secretary of the Royal Society | 23 February 1885 |
| RR/9/175 | Referee's report by William Henry Flower, on two papers 'On the skeleton of the marsipobrancli fishes. Part I - The myxinoids (Myxine, and Bdellostoma)' and 'On the skeleton of the marsipohranch fishes. Part II - Petromyzon' by William Kitchen Parker | 25 January 1883 |
| RR/10/68 | Referee's report by Edwin Ray Lankester, on a paper 'On the morphology of birds' by William Kitchen Parker | 26 March 1887 |
| RR/10/69 | Letter from Edwin Ray Lankester, to the Secretaries of the Royal Society, regarding a paper 'On the morphology of birds' by William Kitchen Parker | 27 March 1887 |
| PP/11/29 | Paper, 'On remnants or vestiges of amphibian and reptilian structures found in the skull of birds, both carinatae and ratitae' by William Kitchen Parker | 1888 |
| PP/11/22/1 | Manuscript, 'True teeth in the young Ornithorhynchus paradoxus [platypus]' by Edward Bagnall Poulton | 1888 |
| PP/11/22 | Paper, 'True teeth in the young Ornithorhynchus paradoxus [platypus]' by Edward Bagnall Poulton | 1888 |
| PP/11/28 | Paper, 'Preliminary note on the development of the skeleton of the apteryx' by Thomas Jeffery Parker | 1888 |
| PP/11/18 | Paper, 'On the secondary carpals, metacarpals, and digital rays in the wings of existing carinate birds' by William Kitchen Parker | 1888 |
| PP/11/35 | Paper, 'Second preliminary note on the development of Apteryx' by Thomas Jeffery Parker | 1888 |
| PP/11/34 | Paper, 'On the vertebral chain of birds' by William Kitchen Parker | 1888 |
| PP/11/35/1 | Manuscript, 'Second preliminary note on the development of Apteryx' by Thomas Jeffery Parker | 1888 |
| RR/5/170 | Referee's report by William Benjamin Carpenter, on a paper 'On some foraminifera from the North Atlantic and Arctic Oceans, including Davis Straits and Baffin's Bay' by William Kitchen Parker and Thomas Rupert Jones | 29 November 1864 |
| RR/5/173 | Referee's report by Thomas Henry Huxley, on a paper 'On the structure and development of the skull in the ostrich tribe' by William Kitchen Parker | 6 December 1865 |
| RR/8/247 | Letter from William Kitchen Parker, to George Gabriel Stokes, regarding a paper [attributed] 'On the structure and development of the skull in sturgeons (Acipenser ruthenus and A. sturio)' by William Kitchen Parker | 26 July 1880 |
| RR/10/66 | Referee's report by William Henry Flower, on a paper 'On the morphology of birds' by William Kitchen Parker | 8 March 1887 |
| MC/14/32 | Letter from [John Samuel] Budgett, Stoke Park, Guildford, to the Treasurer of the Royal Society | 15 April 1885 |
| PP/11/28/1 | Manuscript, 'Preliminary note on the development of the skeleton of the apteryx' by Thomas Jeffery Parker | 1888 |
| MC/15/42 | Letter from [William Kitchen] Parker, Crowland, Trinity Road, Upper Tooting, to [Michael] Foster, Secretary of the Royal Society | 31 May 1889 |
| MS/427/420 | Copy letter from [John Samuel?] Budgett to [John] Evans, Treasurer of the Royal Society | 15 April 1885 |
| MC/14 | Volume 14 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1885-1888 |
| MC/15 | Volume 15 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1889-1892 |