LIASSIC CROCODILES. 139 



of scutes, whilst the imbricated arrangement would allow of a certain sliding 

 motion of the rings upon each other sufficient for the expansion of the chest 

 in breathing. The scutes in the fine specimen in the Wliitby Museum measure 

 about 5 lines in thickness, but are thinned off at the edge. 



Having now detailed the anatomical particulars which a study of the magnifi- 

 cent and unique skeleton of the Teleosaurus, in the museum at Whiby, has enabled 

 me to add to the previous descriptions, by Cuvier and other anatomists, of the 

 osteological structure of this extinct Crocodilian genus, I next proceed to notice 

 the principal examples of the same genus which are preserved in other collections 

 of British Fossil Reptiles. 



The first of these is a fine skull of the same species of Teleosaurus, and 

 from the same lias beds near Whitby in the museum of Mr. Ripley of that 

 town : 



Feet. Inches. 

 The length of the entire skull is . . . . . .29 



From the angle to the beginning of the long symphysis of the lower j.iw 1 :i 



Breadth of the lower jaw at the posterior commencement of symphysis . . 2^ 



Breadth of the extremity of the lower jaw . . . .01 



The extremity of the upper jaw well exhibits in this specimen the characteristic 

 generic modification of its infundibuliform expansion, supporting the terminal 

 nostrils, and resembling the extremity of the elephant's proboscis, wanting the 

 digital process. 



This cranium also clearly exhibits the specific characters by which the Tel. 

 rus Ghapmanni of the Yorkshire lias differs from the Tel. Cadomensis of the Caen 

 oolite, viz. the greater antero-posterior extent of the upper temporal openings as 

 compared with their transverse diameter in the Tel. Chapmanni ; the similar but 

 slighter difference in the form of the orbits, the greater breadth of the interorbital 

 space, which slightly exceeds the transverse diameter of the orbit instead of falling 

 short of that diameter, as in the Tel. Cadomensis. 



A cranium of the Tel. Ghapmanni, in the museum of the Philosophical Institu- 

 tion at York, and another in the museum at Scarborough, offer the same specific 

 characters as the "Whitby specimens. In the Scarborough 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 vertebrse of the Tel. Ghapmanni, from the Whitby lias, measur- 

 ing 1 foot in length ; each vertebra is 2 inches 4 lines in length. A section 

 of these vertebrge showed a small cavity in the centre of the cancellous structure 

 of the body. 



Teleosa,urus Cadomensis. — Specimens of fragments of the jaw, teeth, and vertebra- 



