﻿chim^rid^. 57 



differing in being of much smaller size, the right mandibular tooth 

 described and figured as G. psittacinus (P. 484) displays a contour 

 very suggestive of that of G. oweni. 



Closely related either to G. oweni or to G. dentatus is the following 

 small left mandibular tooth, which exhibits only the outer aspect : — 



P. 481. Type specimen of Chimcera neglecta, Egerton, Proc. Geol. 

 Soc. vol. iv. (1843), p. 153, subsequently named Ischyodus 

 neglectus, Egerton, ibid. p. 156, and Ganodus neglectus, 

 Egerton, Quart. Journ. Geol. Soc. vol. iii. (1847), p. 352, 

 and described and figured by Agassiz, Poiss. Eoss. vol. iii. 

 (1843), p. 347, pi. xl. c. fig. 11, under the name of Chimcera 

 (Ganodus) neglecta; Stonesfield Slate, Stonesfield. 



Egerton Coll. 

 Ganodus dentatus, Egerton. 

 [Plate I. fig. 10.] 



1847. Ganodus dentatus, Sir P. Egerton, Quart. Journ. Geol. Soc. 

 vol. iii. p. 353. 



Type. Left mandibular tooth ; British Museum. 



Mandibidar tooth with a prominently sinuous oral margin and a 

 relatively long post-oral margin, less vertically inclined than the 

 symphysial margin ; median tritor narrow, immediately behind and 

 below the anterior outer tritor ; both outer tritors exposed as a 

 vertical series of tubercles. 



Form. <$f Log. Bathonian (Stonesfield Slate) : Stonesfield. 



P. 614. Type specimen, shown, of twice the natural size, in PL I. 

 fig. 10. Egerton Coll. 



Ganodus rugulosus, Egerton. 



[Plate I. fig. 11.] 



1843. Chimcera rugulosa, Sir P. Egerton, Proc. Geol. Soc. vol. iv. p. 154. 



1843. Ischyodus rugulosus, Sir P. Egerton, ibid. p. 156. 



1843. Chimcera (Ganodus) rugulosa, L. Agassiz, Poiss. Foss. vol. iii. 



p. 347. 

 1847. Ganodus rugulosus, Sir P. Egerton, Quart. Journ. Geol. Soc. 



vol. iii. p. 352. 



Type. Imperfect right mandibular tooth ; British Museum. 



Mandibidar tooth with a very gently sinuous oral margin and a 

 relatively long post-oral margin, much less vertically inclined than 

 the symphysial margin ; median tritor small and narrow, situated 

 well behind and below the anterior outer tritor ; both outer tritors 

 very small. 



Form. 4' Loc. Bathonian (Stonesfield Slate): Stonesfield. 



