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a similar work, appearing at intervals between the years 1831 

 and 1845. In conjunction with Dr. John Richardson he 

 edited the zoological part of the " Voyages of the Erebus and 

 Terror" (1839-1845). He wrote also the first part of the 

 zoological section of the " Voyage of Her Majesty's ship 

 Sulphur " (1843-1845). Devoting his attention not only to 

 zoology, but also to botany, Dr. Gray acquired a very exten- 

 sive acquaintance with the algse and fungi, and wrote various 

 valuable papers on those organisms. Of the many hundred 

 papers written by him on these subjects a comparatively small 

 number relate to sponges, star fishes, and other radiate animals. 

 The molluscs are treated more copiously, among them being 

 memoirs " On the Systematic Arrangement of the Molluscous 

 Animals," " On Perforations made by Patella and Pholas," "On 

 the Byssus of Unio," and " On the Habits of Snails." The 

 structure and classification of reptiles were to Dr. Gray sub- 

 jects of careful and laborious research, and it is perhaps in this 

 department of natural science that he won his chief claims to 

 distinction. For Griffith's " Cuvier " he wrote a treatise en- 

 titled a " Synopsis of the Class Reptilia ; " this was followed 

 by a paper " On a New Arrangement of Reptiles," published 

 in the first volume of the Annals and Magazine of Natural 

 History. To the Mammalia Dr. Gray devoted much attention, 

 he having prepared various papers referring to the cetacea, 

 ruminantia, and quadrumana; to which may be added one of 

 a more general character, entitled " A Description of some 

 Genera and Fifty unrecorded Species of Mammals," published 

 in the tenth volume of the Annals and Magazine of Natural 

 History. The promptitude with which Dr. Gray would seize 

 on the essential points of resemblance and difference between 

 the various types of animals, and the unwearied zeal in the 

 pursuits to which he devoted his life, are well known to all 

 who have taken part in the discussions of the Zoological 

 Society. Dr. Gray assisted largely in the formation of the 

 Zoological, Entomological, Geographical, Microscopical, and 

 Palseontological Societies ; and he took an active part in the 



