ON BRITISH FOSSIL REPTILES. 81 



A cranium of the Teleosaurus Chapmanni, in the museum of the Philo- 

 sophical Institution at York, and another in the museum at Scarborough, 

 offer the same specific characters as the Whitby specimens. In the Scar- 

 borough cranium the diameter of the orbit is 2 inches 3 lines, while that of 

 the interorbital space is 2 inches 6 lines. 



In the museum of the Natural History Society at Lancaster there is a chain 

 of five dorsal vertebrae of the Teleosaurus Chapmanni, from the Whitby lias, 

 measuring 1 foot in length ; each vertebra is 2 inches 4 lines in length. A sec- 

 tion of these vertebrae showed a small cavity in the centre of the cancellous 

 structure of the body*. 



Teleosaurus Cadomensis. — Specimens of fragments of the jaw, teeth and 

 vertebrae of this species have been discovered in the Bath oolite at Enslow, 

 near Woodstock, and in the oolite at Stouesfield. 



Teleosaurus Cadomensis (var.). — Of this species, which is nearly allied to, 

 if not identical with Cadomensis, I have examined a posterior cervical ver- 

 tebra from the oolite near Chipping Norton, now in the collection of Mr. 

 Kingdon of that town. The sides of the centrum are less compressed than in 

 the Teleosaurus Chapmanni, and the articular extremities have a more cir- 

 cular contour, the transverse exceeding the vertical diameter. There is no 

 appearance of a ridge along the under surface : the transverse process of the 

 centrum arises close to the neurapophysis. 



Inch. Lines. 



The length of this vertebra is 1 5 



Transverse diameter of centrum 1 3 



Vertical diameter of centrum 1 1^ 



Teleosaurus asthenodeirus. Nob. — If the cranium of this Saurian should 

 correspond with the characters of the genus Teleosaurus which are exhibited 

 by the vertebrae and scutes here described, a distinct species of this genus is 

 very evidently indicated by them, characterized by the smaller size of the 

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



In the Oxford Museum are preserved two cervical vertebree and a dermal 

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

 extremities and general form of the body of the vertebrae accord with the 

 Teleosaurian type. 



Inches. Lines. 



The length of the centrum is 2 2 



Vertical diameter of articular end 1 6 



Transverse diameter of articular end 1 5 



Antero -posterior 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 Chapmanni and 

 Cadomensis, 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 ad- 



* I have much pleasure in expressing my thanks to S. Simpson, Esq., the Secretary of this 

 excellent Institution, for the prompt acquiescence with my desire to have a section of these 

 vertebra; made ; and likewise to Thos. Satterthwaite, Esq., a member of the Society, for an 

 accurate drawing of the fossil. 



18-11. G 



