Paper, 'Observations on the anatomy and affinities of Phyllirrhoe bucephala' by John Denis MacDonald MacDonald shares observations on Phyllirrhoe bucephala found in the waters of Fiji. He describes the anatomy and nervous system of the creatures in detail. He observes that 'in Heteropoda the viscera are closely packed together so as to occupy the smallest possible space, while they are widely distributed through the abdomen in Phyllirrhoe, thus, again, calling to mind its relationship to the Pteropoda'. Annotations in pencil throughout. Followed by three pages of figures. Subject: Zoology Received 30 March 1855. Communicated by Sir William Burnett. Written by MacDonald at Sydney Harbour [Australia]. This paper was published in full in volume 7 of the Proceedings of the Royal Society as 'Observations on the anatomy and affinities of the Phyllirrhoë bucephala (Peron)'. 10 December 1854