| RefNo | Title | Date |
| NLB/14/341 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 20 February 1897 |
| NLB/25/686 | Copy letter from Robert William Frederick Harrison, to Dr Arthur Willey, Fellow of the Royal Society | 9 December 1902 |
| NLB/33/563 | Copy letter from Robert William Frederick Harrison, to Arthur Willey, Fellow of the Royal Society, Eversley, Long Lane, Finchley, N. | 1 October 1906 |
| NLB/42/399 | Copy letter from Robert William Frederick Harrison to Messrs Harrison & Sons | 4 June 1910 |
| NLB/54/690 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Arthur] Willey, FRS | 3 August 1917 |
| NLB/65/90 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Arthur] Willey, FRS; Thackeray Hotel, W.C.1. | 25 July 1923 |
| EC/1902/17 | Willey, Arthur: certificate of election to the Royal Society | |
| PP/16/7/1 | Manuscript, 'On the development of the atrial chamber of Amphioxus [lancelet]' by Arthur Willey | 1890 |
| PP/16/7 | Printed proof, 'On the development of the atrial chamber of Amphioxus [lancelet]' by Arthur Willey | 1890 |
| PP/16/7/2 | Figures, atrial chamber of Amphioxus [lancelet] by Arthur Willey | 1890 |
| PP/19/20 | Paper, 'Observations on the post-embryonic development of Ciona intestinalis and Clavelina lepadiformis' by Arthur Willey | 1892 |
| MC/17/89 | Letter from [Edwin] Ray Lankester, The Athenaeum, Pall Mall, London, to the Royal Society | 14 December 1897 |
| MC/17/111 | Letter from [Sir Edwin] Ray Lankester, 40 Nottingham Place, London, to [Michael] Foster | 16 January 1898 |
| MC/17/126 | Letter from [John Willis] Clark, Registry of the University, Cambridge, to The Royal Society | 7 March 1898 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |