ICHTHYOSAXJKTD.E. 21 



Owen in his ' Cretaceous Reptilia ' (Mon. Pal. Soc), pi. xxii. 

 This specimen was associated with the mandible jSo. 32810. 



Taylor Collection. 



47266. A series of twenty-four associated trunk vertebral centra, of 

 large size, and mostly imperfect; from the Cambridge 

 Greensand. These specimens belong to the same indi- 

 vidual as the teeth No. 47265. Gardner Collection. 



35303. The imperfect centrum of a large dorsal vertebra ; from the 

 Cambridge Greensand. Purchased, 1859. 



35312. An associated series of eight smaller vertebral centra ; from 

 the Cambridge Greensand. Purchased, 1859. 



35303 a. The centra of two smaller dorsal vertebrae ; from the 

 Cambridge Greensand. Purchased, 1859. 



35346. The nearly perfect centrum of a small trunk vertebra: from 

 the Cambridge Greensand. Purchased, 1859. 



47270. The centra of two small dorsal vertebrae ; from the Gault 

 of Folkestone. The central pit on the anterior face is 

 very distinct. Gardner Collection. 



R. 15. The centrum of a larger trunk vertebra : from the Folke- 

 stone Gault. Gardner Collection. 



33059. The centrum of a large trunk vertebra ; from the Folke- 

 stone Gault. Purchased, 1858. 



33244. The centrum of a very large trunk vertebra; from the 

 Cretaceous of Kursk, Russia. The transverse diameter 

 is 0,130. Presented by Col. Kiprijanoff. 



The following specimen may perhaps indicate a distinct species. 



R. 1308. The imperfect centrum of a dorsal vertebra; from the 

 Cambridge Greensand. This specimen is remarkable for 

 the extreme flatness of the greater part of the terminal 

 faces, the cupping being confined to a deep central pit. 

 In this respect it agrees with tho larger specimen from 

 the Russian Cretaceous figured by Kiprijanoff in the 

 1 Mem. Ac. Imp. St. lVtcrsbourg,' vol. xxxi. art. 6, pi. viii., 

 as Poh/ptychodon, but subsequently referred to /. latimanus 

 (vide infra, pp. 53, 54). 



Presented by 11. Lydekker, Esq., 1888. 



