68 
CHIMiEEOIDEI. 
1876. Ischyodus brevirostris, E. T. Newton, Quart. Journ. Geol. Soc. 
vol. xxxii. p. 326, pi. xxi. fig. 5. [Teeth; British Museum.] 
1878. Ischyodus brevirostris, E. T. Newton, Chimseroid Fishes Brit. 
Cret. Rocks (Mem. Geol. Surv.), p. 27, pi. ix. 
1888. Ischyodus brevirostris, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. iv. p. 42, pi. vii. figs. 10-13. 
Type. Imperfect palatine tooth. 
Mandibular tooth notably robust, with a deeply sinuous oral 
margin, acute eminences corresponding to the outer tritors, and 
the beak prominent; post-oral margin much less vertically inclined 
than the symphysial margin; beak-tritor minute ; outer tritors well- 
developed ; median tritor narrow or of moderate width, occupying 
the greater portion of the oral surface immediately behind the 
anterior outer tritor. Palatine tooth with the posterior inner tritor 
of moderate or large size, and the median tritor not extending so 
far forwards as this ; outer tritor much elongated. Vomerine tooth 
much deeper at the symphysis than externally. 
Form. <Sf Loc. Lower Greensand : Kent. Albian : Kent, England, 
and St.-Croix, Switzerland. Cenomanian and Turonian : Cambridge¬ 
shire and Kent. Greensand: Amuri Bluff, New Zealand (Newton 
and Davis). 
(i.) Lower Greensand , Maidstone. 
41682 a. Elongated right mandibular tooth, described and figured 
by E. T. Newton, op. cit. p. 31, pi. ix. fig. 10. 
Toulmin-Smith Coll. 
P. 1155. Fragmentary left mandibular tooth, noticed by E. T. New¬ 
ton, op. cit. p. 28. Egerton Coll. 
P. 3091-2. Two imperfect mandibular teeth. Enniskillen Coll. 
P. 475. Right palatine tooth, assigned to “ Ghimcera ( Isehyodon ) 
agassizii ” by Agassiz, tom. cit. pi. xl. c. figs. 14, 15. 
Egerton Coll. 
(ii.) Gault , Folkestone. 
473 73 a, 47177. Right mandibular tooth and a pair, the former 
and one of the latter being figured by E. T. Newton, 
op. cit. pi. ix. figs. 3-5. Gardner Coll. 
47175,47178, P.27, P. 28. Four pairs of mandibular teeth. 
Gardner Coll. 
47173-74, P. 29. Six mandibular teeth, three of each side. 
Gardner Coll. 
