PLESIOSAUEID.E. 



185 



35343. The centrum of a smaller dorsal vertebra, in which the 

 terminal mammillae are very indistinct. Purchased, 1860. 



35285 a. The centra of three dorsal vertebrae probably associated 

 with No. 35285. The mammillae are indistinct. 



Purchased, 1859. 



46378. The centrum of a similar dorsal vertebra. 



Purchased, 1876. 



35460. A similar specimen. Purchased, 1860. 



R. 1304. The imperfect centrum of a similar dorsal vertebra ; from 

 the Gault of Folkestone, Kent. Xo history. 



35284. The imperfect centrum of an anterior caudal vertebra. 

 This specimen approximates to the larger caudal of C. 

 herahardi figured by Kiprijanoff in the ' Mem. Ac. Imp. 

 St. Petersbourg,' vol. xxx. art. 6, pi. iii. fig. 1, but has a 

 small central mammilla. The later caudal represented in 

 fig. 4 of the same plate as Plesiosaurus neocomiensis has 

 similar characters. In all these specimens the chevron- 

 facets are confined to the posterior border. 



Purchased, 1859. 



36151 x. Two small propodial bones (one imperfect), figured by 

 (Fhj.) Owen, op. cit. pi. vi. figs. 12, 13, as P. neocomiensis. 

 There are no valid grounds for this reference. 



Purchased, 1861. 



Cimoliosaurus bernardi (Owen 1 ). 

 Syn. Plesiosaurus bernardi, Owen 2 . 



Plesiosaurus ichthyospondylus, Seeley 3 . 

 (?) Plesiosaurtig ptzchyomus, Owen ' (in parte). 

 (?) Plesiosaurus balticus, Schroder 5 . 

 Imperfectly known ; much larger than the preceding. Cervical 

 and dorsal vertebrae comparatively short ; the former with the 

 terminal faces very deeply cupped, and widely bevelled at the 

 edges ; with the oblique zygapophysial ridge less strongly marked 

 than in the preceding species. Dorsals without central mammillae, 

 and with bevelled edges to the terminal faces of the centra. In the 

 ccrvicals the terminal faces of the centra are less elliptical than in 

 other species. The type cervical vertebra (Owen. 'Cretaceous 



1 In Dixon's Geology of Sussex, 1-t ed, p. 396 (1850). "Plesiosaurus. 



- hoc. fit. 



'■' Index to Aves &c. in Cambridge Rluseum, p. xvii (I860). 



1 Cretaceous Reptilia (Mon. Pal. Sue.), pt. i. pi. xx. (I 



5 Jahrb. preuss. gcol. Landesanstalt for 1881, p. 297 (1885). 



