ROOM IV. 



ICHTHYOSAURUS LATIFRONS. 



385 



WALL-CASE E. [5.] 



ICHTHYOSAURUS LONGIROSTRIS. Wall-case E. In the 

 middle compartment of Case E there is part of the skeleton 

 of an Ichthyosaurus from Whitby, about six feet in length. 

 It is remarkable for the exceedingly slender and elongated 

 muzzle ; the skull is crushed ; and with the exception of the 

 chain of vertebrae which extends to the tail, and a few bones 

 of one paddle, there are no characteristic parts preserved. The 

 specific name, longirostris, is affixed to this specimen ; but 

 I cannot ascertain that it is figured or described. 



ICHTHYOSAURUS LATIFRONS. ! (Konig.) Wall-case E. The 

 mutilated cranium, with a large foramen on the top of the 

 head between the orbits, and attached to a considerable 

 portion of the vertebral column, deposited in Case E, is 

 figured and described by Mr. Konig in his " Icones Sectiles" 

 PL XIX., under the name of Ichthyosaurus latifrons. This 

 specimen is characterised by the great breadth of the fore part 

 of the cranium, and the large size of the parietal foramen. 

 The periphery of the vertebras is flatter than in those of other 

 species ; but I am not aware that other specimens have been 

 found with a similar character. The upper portion of the 

 circle of sclerotic plates remains in the orbit. 



RETROSPECTIVE SUMMARY. From the data afforded by the 

 remains of the trees and plants, and of the herbivorous and 

 carnivorous reptiles, imbedded in the fluviatile deposits of the 

 south-east of England, described in the previous chapter, we 

 endeavoured to determine the physical conditions, and the 



1 " Brit. Assoc. Rep." 1839, p. 122. 



c c 



