ROOM IV. ICHTHYOSAURUS INTERMEDIUS. 377 



the intermaxillary bones, and of the dentary bones of the 

 lower jaw. The malar bone is remarkably long and slender. 

 The cranium is flat, and the orbits are very large. 



The teeth are slender ; there are from 60 to 70 on each side 

 the upper jaw, and 60 on each ramus of the lower jaw. 



The anterior extremities or paddles are much larger than 

 the posterior pair, and very strong and massive. The shafts 

 of the humerus and femur are relatively long, and their distal 

 ends broad. 



This species, according to the known specimens, attains a 

 length of thirteen or fourteen feet ; the largest teeth are 1 J 

 inch in length. It was named Ich. chirostrongulostinus, (sig- 

 nifying round-boned-paddle) by Mr. Hawkins ; and is figured 

 in PL XV. XVI. of his work. 



WALL-CASE B. [2.] 



On thf Tnn I ^" wo P^dles an <l I Ichthy. intermedius, ribs I Skull and jaws of 

 | detached bones. | and vertebral column. | Ichthy. longipennis. 



Upper Shelf. Miscellaneous specimens of detached parts. 



ICHTHYOSAURUS INTERMEDIUS * (Conybeare). Wall-cases A, 

 B, and E. The beautiful example of this species, figured in 

 Air. Hawkins's work, PL XX. is placed in Wall-case A. 



In Case B, there is a splendid specimen, seven feet long, 

 from Street, with the vertebral column gently arched, and the 

 four paddles entire. It is figured in Mr. Hawkins's Memoir, 

 PL XVII. 



A skeleton, six feet long, showing the upper surface of the 

 cranium and spinal column, with the four paddles exquisitely 

 displayed, is in the lowermost compartment of Case E. 



The name given to this species by Mr. Conybeare, is indi- 

 cative of the intermediate character of the teeth, which are 



1 "Brit Assoc. Reports/ 1839, p. 120. 



