Manchester Memoirs, Vol. Iw. (\g\d), No. II. 13 



There are actually 16 vertebrae included under this 

 number, of these one is a caudal of Microcleidus hoiiia- 

 lospofidylus (Owen), the other 15 are cervicals of Sthena- 

 rosmcrus Dawkinsi, Watson. It is possible that these 

 vertebrae are the type specimen of Plesiosauriis coelospon- 

 dylus, Owen, which consisted of 16 cervicals, two of 

 which connected by matrix were cut through medially, 

 these cannot be found. As Owen's description is so slight 

 that it is impossible to check this conjecture by it, his 

 species cannot stand. 



No. 854. Three lumbar vertebrae united together by 

 matrix. These belong to a type which in a former 

 communication I suggested might be identical with 

 Plesiosaurus Guilelini Iinperatoris, Dames. 



Possibly Seeley's P. macropterns is identical with them. 



No. 855. Two late cervicals resembling those of 

 Microcleidiis homalospondylHS, but somewhat longer and 

 more depressed. 



No. 856. Four middle cervicals of Sthenarosauriis 

 Dmvkinsi, Watson. 



No. 858. Two dorsal centra oi Microcleidus. 



No. 859. The distal half of a small humerus. 

 Unnumbered. 



Three ver}^ large short dorsals, with very short and 

 stout transverse processes, 



A much weathered head of a very large femur. 

 These probably belong to Rluniialeosaurus Cramptoni. 

 The proximal end of a small and rather slender femur. 



