82 ~ REPORT— 1841. 



joining scute, according to the characteristic disposition of this fish-like 

 covering of the present extinct marine genus of Crocodilians. 



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 can- 

 cellated cavity tilled with calcareous spar, as in the Teleosaurus Chapmanni. 

 These vertebrae present the slightly concave articular extremities, and the 

 other characters of the genus Teleosaurus. The length of the centrum, 

 measured along the under surface, is 2 inches 6 lines; vertical diameter of 

 articular end 2 inches; transverse diameter 1 inch 10 lines; transverse dia- 

 meter of the middle of the body 1 inch. Both the inferior and lateral sur- 

 faces 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 lines ; 

 that of the base of the spinous process 1 inch 9 lines. The transverse dia- 

 meter of the spinal canal 7 lines ; its vertical diameter ^\ lines. 



These vertebra are cemented together by a matrix, which closely resem- 

 bles the gray Kimmeiidge clay : and a portion of a species of Pecten is at- 

 tached, which is one of the characteristic fossils of the oolite group of secondaiy 

 rocks, especially the Oxford clay. 



Steneosaurus. 



Ide Gavial d' Honjieiir, Cuv. 



Steneosaurus rostro-minor, Geoffroy. 



The generic name Steneosaurus, proposed by Geoffroy St. Hilaire for 

 the Gavial-like Crocodilians with subterminal nostrils, but applied by him to 

 species with vertebrae of two distinct systems, and altogether rejecte'd by M. 

 Hermann von Meyer, I propose to retain for that section of the Geoffroyan 

 genus, including the species with vertebrae subconcave at both extremities, as 

 in the genus Teleosaurus. 



Remains of the genus Steneosaurus, thus defined, occur in the Kimme- 

 ridge clay at Shotover, and in the great or middle oolite. 



I shall first describe a mutilated cranium from Shotover, preserved in the 

 museum of Professor Buckland at Oxford. In this specimen the sides of 

 the inter-temporal crest slope away, except at its anterior part, where it 

 expands to one inch in breadth, and is convex : its longitudinal contour is 

 slightly convex. The posterior boundary of the temporal fossa sinks below 

 the level of the upper part of the cranium, and likewise terminates above in 

 a sharp ridge, as in Teleosaurus. The ex-occipitals send out a transverse 

 ridge, increasing in size to the mastoid process, below which there is a fora- 

 men : the cranial canal is cylindrical. The ex-occipitals so completely sur- 

 round the posterior aperture of the cranium, that when the basi-occipital is 

 displaced it remains entire. This is not the case in the Teleosaurus. 



Steneosaurus. Teleosaurus Chapmanni. 



Inches. Lines. Inches. Lines. 



Breadth of posterior part of cranium 110 5 Q 

 From lower margin of condyle to in- "1 . 



ter-temporal ridge J 



Length of temporal fossa 5 2 6 



Breadth of temporal fossa 5 2 



In the upper jaw the teeth are closer together and relatively larger: there are 

 3 teeth in front of, and 27 behind, a short diastema : there is no groove along 

 the inner side of the ramus of the jaw. In the lower jaw the post-articular 



