66 VERTEBRATA. 



Crocodilicms. 



No 244. Crocodilus Hastingsiae, Owen. 



Skull and Lower Jaw. The trae 

 Crocodiles (Tertiary and Recent species) 

 have vertebra? concave in front and con- 

 vex behind, (excepting the first caudal 

 vertebra which is double-convex), and 

 short, broad muzzles. The first tooth in 

 the lower jaw perforates the palatal pro- 

 cess where it is concealed when the 

 mouth is shut ; the fourth tooth in the same jaw is received into a notch exca- 

 vated in the side of the alveolar border of the upper jaw, and is visible when the 

 mouth is closed. These relics of the G Hastingtiw, distinguished for its large, 

 blunt head, were found in the Middle Eocene at Hordwell Cliffs, England, along 

 with a true Alligator, and not far from the remains of the Ga vial-like G. Dixoni, 

 so that these three forms, now geographically restricted, were associated at near- 

 ly the same period in rivers flowing over what now forms the south-coast of Eng- 

 land. As in all true Crocodiles, there is a preponderance of teeth in the upper 

 jaw. The specimens are in the British Museum. 



Size, 19 x 11. Price, with mountings, $12.00. 



No. 245. Crocodilus Champsoides, Owen. 



Skull. This species is distinguished for the large size of the temporal holes 

 as compared with the orbits, for the regular and rapid diminution of the head 

 towards the snout, and for the great length and slenderness of the muzzle com- 

 pared with the G. biporcatiLS. This skull was found in the London Clay (Eocene) 

 of the Isle of Sheppey, and is in the British Museum. Size, 9x4. Price, $1.00. 



No. 246. CrOCOdilUS toliapicus, Owen. 



Head. This is probably identical with the G. Spcneeri of Buckland. The 

 teeth, numbering 84, are more uniform and more separated than in living Croco- 

 diles. The remains of this species, in the hands of Cuvier, afforded the first cer- 

 tain proof of the existence of a true Crocodile in the Eocene deposits of England. 

 This specimen is remarkably fine, — both jaws and teeth being beautifully pre- 

 served. It is from the same locality and Museum as the preceding. 



Size, 25 x 12. Price, $ 6.0O. 



No. 247. Crocodiliis biporcatus, Cuv. 



Head. This Crocodile, much resembling the species of the same name 

 now living in the Granges, was discovered in the Sewalik Hills of India (Miocene), 

 and is in the British Museum. Size, 18 x 10. Price, $3.50. 



