ICHTHYOSATJRID^;. 



109 



R. 1199. Slab exhibiting the cerebral aspect of the hinder portion 

 of the cranium and a part of one mandibular ramus of a 

 considerably larger specimen ; probably from Lyme-Eegis. 

 The contour of the foramen magnum, of the supratem- 

 poral fossae, and of the orbits is preserved. The basi- 

 occipital has the stapes still articulating with it on the 

 right, and the right quadrate remains in a displaced 

 position. No history. 



2040. Slab showing the posterior portion of the cranium of a 

 {Fig.) comparatively small individual, with the component bones 

 displaced ; from Lyme-Eegis. This specimen exhibits the 

 basioccipital, basisphenoid, presphenoid, quadrate, exoc- 

 cipitals, supraoccipitals, parietals, and columellas. It is 

 described and the columella of the right side figured by 

 A. Smith Woodward in the Proc. Zool. Soc. 1886, pp. 405- 

 406, fig. 1. Hawkins Collection. Purchased, 1834. 



44027. Two transverse sections from the anterior portion of the 

 rostrum of a comparatively large skull ; from Lyme-Eegis. 

 Not improbably belonging to /. communis. 



Purchased, 1873. 



28287. The basioccipital of a very large individual ; from Lyme-Eegis. 

 Probably belongs to I. platyodon. Purchased, 1853. 



47430. A smaller basioccipital ; from Lyme-Eegis. This specimen 

 is specifically distinct from the preceding. 



Sharp Collection. Purchased, 1876. 



41320. A much smaller basioccipital ; from Lyme-Eegis. 



Purchased, 1869. 



R. 260. A very similar specimen ; from Lyme-Eegis. 



Egerton Collection. Purchased, 1882. 



2081*. A basioccipital agreeing in size with No. 41320, but be- 

 longing to a distinct species ; from Lyme-Eegis. 



Hawkins Collection. 



2123*. A very similar specimen ; from Lyme-Eegis. 



Hawkins Collection. 



R. 1203. A basioccipital specifically distinct from the preceding ; 

 from Lyme-Eegis. No history. 



R. 1203 a. A crushed basioccipital with the exoccipital in apposition ; 

 from Lyme-Eegis. No history. 



