418 Dr. C. W, Andrews on some new Plesiosauria 



Linnseus unite in declaring the mandrill to be the species to 

 which the name of sphinx should be given. The "cauda 

 brevis erecta " would in no wise answer for the tail of the red 

 baboon, but describes perfectly the rudimentary one of the 

 mandrill. 



Therefore this baboon must be known in the future as 

 Papio sphinx, with S. maimon given to it by Linnaeus in his 

 twelfth edition as a synonym ; and the red baboon from the 

 west coast of Africa, which has always been called sphinx, 

 must be known as Papio jmpio, it being the Cynocephalus 

 7^c//)/o, Desmarest (* Mammalogie,' 1820, p. 69), who seems 

 to have been the first to give the species a name other than 

 sphinx incorrectly applied by previous writers. 



XLVII. — On some new Plesiosauria from the Oxford Clay of 

 Peterborough. By C. W. ANDREWS, D.Sc, F.R.S., 

 British Museum (iSTat. Hist.). 



(Published by permission of tbe Trustees of the British Museum.) 



In the course of the preparation of a catalogue of the Plesio- 

 sauria from the Oxford Clay of Peterborough it has been 

 necessary to examine the great collection of the remains of 

 these reptiles obtained by Mr. A. N. Leeds, and it has become 

 clear that, in addition to the forms already described, there 

 are several others at present unnamed. Since it will be some 

 time before the Catalogue can be published, it seems desirable 

 to give a brief preliminary account of the more important 

 new types. 



The chief genera of Elasmosaurian Plesiosaurs already 

 known from the Oxford Clay are Murcenosaurus and Crypto- 

 cleidus. Of the first of tliese three species are recognized, 

 viz. 31. leedsi, Seeley, AI. platydis, Seeley, and M. durobri- 

 vensisy Lydekker. Another species referred to Murcenosaurus 

 by Seeley is now placed as a separate genus, P icrocleidus , the 

 specific name being P. heloclis. The remains of Cryptocleidus 

 have not been fully examined, but so far only one species, 

 C. oxo7iiensis, is recognized. In addition to the above, it is 

 now proposed to establish a fourth genus, Tricleidus, for the 

 reception of a small Plesiosaur presenting some very marked 

 peculiarities both in its skull and shoulder-girdle. 



Of the Pliosaurs there are three distinct types, viz. Pelo- 

 neusfes, Pliosaurus, and a short-snouted form which seems in 



