ICHTHTOSATJRID^:. Ill 



R. 1205 a. The centra of a considerably smaller atlas and axis 

 {Fig.) vertebrae ; from Lyme -Regis. Figured by Egerton, op. cit. 



pi. xiv. fig. 3. The two centra are separate, but the 



intercentrum is anchylosed to the axis. 



Presented by Sir P. Egerton, Bart. 



R. 1509. The anchylosed centra of the atlas, axis, and third cervical 

 vertebrae of a slightly larger form ; from Lyme-Regis. 

 The intercentral facets between the atlas and axis are 

 distinctly shown. No history. 



R. 265. The anchylosed centra of the atlas and axis vertebrae of 

 a very small individual ; from Lyme-Regis. 



Egerton Collection. 



R. 1205 b. The cranial intercentrum of a very large individual ; 



Fig.) from Lyme-Regis. Figured by Egerton, op. cit. pi. xiv. 



figs. 4-6. Presented by Sir P. Egerton, Bart. 



R. 262. The centrum of an anterior cervical vertebra of a medium- 

 sized form ; from Lyme-Regis. The terminal faces are 

 pentagonal and subcordiform, with the upper costal articu- 

 lation partly confluent with the neurapophysial facet. 



Egerton Collection. 



16052. The centrum of a larger cervical vertebra ; from the Upper 

 Lias of Blisworth, Northamptonshire. Found in 1837 by 

 Miss Raker. Purchased. 



2074*. The centrum of a small cervical vertebra ; from Lyme-Regis. 



Hawkins Collection. 



R. 68-69. The centra of the anchylosed atlas and axis, and of several 

 cervical vertebrae, together with several of the neural archos 

 and spines ; from the Upper Lias of Boll, Wurtemberg. 

 The suture between the atlas and axis is obliterated. 

 These specimens not improbably belong to /. acutirostris. 

 Transferred from the Museum of Practical Geology, 1881. 



23011. The centrum of a dorsal vertebra of a comparatively largo 

 species ; from Lyme-Regis. Purchased, 1848. 



33182. The centrum of a posterior dorsal vertebra agreeing in size 

 with the preceding ; from Lyme-Regis. 



Purchased. About 1844. 



2070*. The imperfect centra of two caudal vertebrae cemented to- 

 gether by matrix ; from Lyme-Regis or Street. 



Hawkins Collection. 



