CHIMiERIDiE. 
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 Chimcerci neglectci , 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 Chimasra 
{Ganodus) neglectci; 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. 
Mandibular 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, Log. Bathonian (Stonesfield Slate) : Stonesfield. 
P. 614. Type specimen, shown, of twice the natural size, in PI. I. 
fig. 10. Egerton Coll. 
Ganodus rugulosus, Egerton. 
[Plate I. fig. 11.] 
1843. Chimcerci rugulosa, Sir P. Egerton, Proc. Geol. Soc. vol. iv. p. 154. 
1843. Ischyodus rugulosus, Sir P. Egerton, ibid. p. 156. 
1843. Chimcerci ( 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. 
Mandibular 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' Log. Bathonian (Stonesfield Slate): Stonesfield. 
