142 BRITISH rOSSIL REPTILES. 



genus which are exhibited by the vertebrjB and scutes here described, a distinct 

 species is very evidently indicated by them, characterised by the smaller size of the 

 cervical ribs, and the consequently weaker structure of the neck. 



In the Oxford Museum are preserved two cervical vei'tebraj and a dermal bone 

 of this species, from the Kimmeridge clay at Shotover. The articular extremities 

 and general form of the body of the vertebrjB accord witli the Steneosaurian type. 



Inches. Lines. 

 The length of the centrum is . . . • .22 



Vertical diameter of articular end ... ... 1 6 



Transverse diameter of articular end . . . . . .15 



Antero-po.sterior extent of lower transverse process . . . . 



6 



This process arises near the lower surface of the centrum, about half an inch 

 from the anterior extremity of the bone. It is separated about the same distance 

 from the upper transverse process, which is continued from the base of the 

 neurapophysis ; both the supports of the cervical rib are one third smaller than 

 the corresponding processes in the Teleosauri Ghapmanni and Gadomensis, and are 

 less extended from the sides of the vertebra. 



The dermal scute is devoid of a ridge ; one half of the external surface is pitted 

 with well-defined hemispherical depressions, separated from each other by about 

 half their breadth, the smallest being nearest the margin ; the other half of the 

 scute is smooth, and indicates that it was overlapped by the adjoining scute, 

 according to the characteristic disposition of this fish-like covering of the present 

 extinct marine g-enus of Crocodilians. 



&^ 



Species — Indetermina ta . 



In the Hunterian Collection are two entire dorsal vertebrae, with part of a 

 third, fractured through the middle of the body, and displaying a small cancellated 

 cavity filled with calcareous spar, as in the Teleosaurus Ghapmanni. These 

 vertebras present the slightly cod cave articular extremities, and the other charac- 

 ters of the genus Teleosaurus. The length of the centrum, measured along the 

 under surface, is 2 inches G lines; vertical diameter of articular end 2 inches; 

 transverse diameter 1 inch 10 lines ; transverse diameter of the middle of the body 

 1 inch. Both the inferior and lateral surfaces of the body are regularly concave, 

 lengthwise; and smooth, except near the expanded articular extremities, where 

 they are striated in the axis of the vertebra. 



The antero-posterior extent of the transverse process is 1 inch 6 Hues; that 

 of the base of the spinous process 1 inch 9 lines. The transverse diameter of the 

 spinal canal 7 lines ; its vertical diameter 4^ lines. 



