﻿62 CHIM^EROIDET. 



oral surface below and behind the apex of the anterior outer tritor. 

 (?) Palatine tooth with the posterior inner tritor of large size, and the 

 median tritor extending further forwards than this ; outer tritor 

 much elongated and extending far forwards. (?) Vomerine tooth of 

 the typical quadrate outline, with about six uniform tritors upon the 

 oral margin. 



Form. Sf Loc. Oxford Clay : Oxfordshire and Northamptonshire. 

 Kimmeridge Clay : Oxfordshire and Dorsetshire. 



P. 476. Left mandibular tooth, right palatine, and right and left 

 vomerine teeth, described and figured by Agassiz, torn. cit. ; 

 Kimmeridge Clay, Shotover, near Oxford. Egerton Coll. 



41173, 41226, 41395, 41863-4, 41961. Three mandibular teeth, 



and two pairs of small mandibular teeth ; Kimmeridge 

 Clay, Weymouth. Purchased, 1868-70. 



P. 1159 a. Small left mandibular tooth ; Kimmeridge. 



Egerton Coll. 



P. 3094. Three mandibular teeth ; Weymouth. 



EnnisTciUen Coll. 



41174, 41225, 41397. Left palatine tooth, and two imperfect ex- 



amples of the right side ; Weymouth. Purchased, 1868-69. 



P. 3093 a. Imperfect left palatine tooth ; Weymouth. 



EnnisTciUen Coll. 



41396, 41962. Imperfect right vomerine tooth, and a pair of larger, 

 but similar teeth ; Weymouth. Purchased, 1869-70. 



41865. Mandibular tooth of young ; Weymouth. Purchased, 1870. 



Ischyodus dufrenoyi, Egerton. 



1843. Cliimcera dufrenoyi, Sir P. Egerton, Proc. Geol. Soc. vol. iv. 



p. loo. 

 1843. Ischyodus duvernoyi, Sir P. Egerton, ibid. p. 156 (errore). 

 1867. Ischyodus dufrenoyi,!!. E. Sauvage, Catal. Poiss. Form. Second. 



-Boulonnais (Mem. Soc. Acad. Boulogne, vol. ii.), p. 73, pi. iv. 



fig. 12. 



Type. Left mandibular tooth. 



Mandibular tooth much compressed, with a deeply sinuous oral 

 margin, a prominent symphysial beak, and the post-oral margin 

 much more inclined backwards than the symphysial margin, which 

 is gently arched; beak-tritor veif small; outer tritors well 

 developed ; median tritor occupying the greater portion of the oral 



