SAURODON. 



103 



Specific Characters. — Maxilla remarkable for tlie unusually great depth and 

 relatively long extent of the anterior portion, which has a gently convex oral 

 border, with small teeth in front and the largest teeth on the convexity not much 

 larger than those immediately behind. Teeth smooth, not facetted. 



Description of Specimen. — The type specimen in the Mantell Collection (no. 

 28388) remains unique, and is shown in outline in Text-fig. 30. The anterior 



Fig. 30. Fortheus daviesi, Newton ; outline of right maxilla, the type specimen, three quarters nat. size. — 

 Chalk; Maidstone. Mantell Collection (B. M. no. 28388). o., faeette overlapped by premaxilla; 

 pi., articulation for palatine. 



extension of the maxilla (o.), which would originally be overlapped by the 

 premaxilla, is relatively large; and the small palatine articulation {pi.) is only 

 slightly raised above the upper border of the bone. So far as preserved, the outer 

 face of the bone is not ornamented. 



Horizon and Locality. — Probably zone of Holaster sulxjlobosus : near Maidstone, 

 Kent. 



Among specifically indeterminable remains of Porthens may be mentioned a 

 fragmentary mandible from the zone of Holaster suhijlobosus, Hailing, Kent, which 

 has been provisionally referred to Portheus gaultinus, E. T. Newton, Quart. Journ. 

 Geol. Soc, vol. xxxiii, 1877, p. 520. The type specimen of the latter species was 

 obtained from the Gault of Folkestone. 



Genus SAURODON, Hays. 



Saurodon, I. Hays, Trans. Amer. Phil. Soc, n. s., vol. iii, 1830, p. 475. 

 Daptinus, E. L>. Cope, Proc. Acad. Nat. Sci. Philad., 1873, p. 339. 



Generic Characters. — Teeth hollow, in deep sockets, compressed to a sharp edge 

 in front and behind ; those of the maxilla, as also those of the deutary, almost 

 uniform, only slightly increasing in size backwards, and those of the premaxilla 

 not much enlarged ; the inner margin of each dental alveolus deeply notched. A 



