50 STRATA OF TILGATE FOREST. 



in the jaws of the same species, or belonged to different species of the 

 same genus, cannot at present be determined. 



var. a. Nearly cylindrical; diminishing very gradually towards the 

 apex, which is obtuse. This variety is represented by Lhwyd, figs. 1318 

 and 1319 ; the largest specimens are of this kind. 



var. b. A slender delicate tooth, rather compressed, curvature gradual, 

 apex slightly acuminated ; Mr. Clift, who examined a tooth of this species, 

 observes " that there can be no doubt of its having belonged either to the 

 crocodile, or monitor ; I know of no other animals whose teeth have the 

 lateral ridges so strongly defined." I have several teeth of this kind from 

 Stonesfield, collected by Mr. LyeU. 



var. c. A slender tooth, nearly straight ; very similar in form to the 

 teeth in the anterior part of the jaw of the Gavial or Gangetic crocodile*. 



25. Scales of an irregular rhomboidal form, exceedingly thick, with 

 one extremity sharply pointed ; these are associated with the teeth above 

 described, and perfectly resemble the scales of the recent aUigator in 

 Exeter 'Change. 



VEETEBR^. 



These diflPer from each other in the number, situation, and form 

 of their processes, which vary according to the situation the vertebrae 

 respectively occupied in the spinal column. In their general characters 

 they resemble those of the crocodile, from which however they are 

 separated, in having both faces shghtly concave. A similar structure has 

 been noticed by Cuvier, in the vertebrse of an unknown fossil crocodile, 

 discovered at Havre and Honfleur; and it is to this species that the 

 osseous remains of the TUgate beds most nearly correspond. 



The vertebrae are of three kinds, viz, dorsal, lumbar, and caudal; the 

 cervical have not been discovered. 



26. " Dorsal. The most perfect specimen resembles the vertebras 

 delineated by Lhwyd, fig. 1607, and fig. 11. PI. If. of Cuvier; or more 



* On the authority of Clift, Esq. 



f Description des Ossemens des Environs d'Honfleur et du Havre. Cuvier, Animaux 

 Fossiles, tome IV, Crocodiles Fossiles. 



