ACTINOPTERI. 163 



Enchodus gentryi (Cope). 



Pliasganodus gentryi Cope, Proc. Amer. Philos. Soc. Phila., XIV, 1875, p. 



362. Miocene of Cumberland Co., N. J. 

 Enchodus gentryi Hussakof, Bull. Amer. Mus. N. H., XXV, 1908, p. 72 



(type). 



Long tooth of jaw anteriorly slender, curved back, front view 

 shows cutting-edge from apex to base and no cutting-edge or 

 angle on posterior face (unless at damaged apex). On one side 

 cementum smooth, on other and posteriorly crown keeled-striate 

 from base to near apex. Length 10 mm. (From Cope.) 



This species seems to be distinguished by having a single cut- 

 ting-edge on the large front teeth in the jaw. 



Formation and locality. Known only from the type now in 

 the American Museum at New York. It was from the Miocene 

 [the Kirkwood formation, K.] at Shiloh in Cumberland County. 

 I have not seen any material. 



Enchodus tetr^cus Cope. 



Enchodus tetrcecus Cope, Rep. U. S. Geol. Surv. Terr., II, 1875, p. 278. 

 Cretaceous No. 4, Delaware and New Jersey. 

 Hay, Bull. Amer. Mus. Nat. Hist., XIX, 103, p. 74, figs. 54-55 (types). 

 Hussakof, Bull. Amer. Mus. Nat. Hist, XXV, 1908, p. 73 (note on types). 



Elongate anterior teeth narrow and slender, greatest basal 

 diameter at right angles to upper part of crown. Posterior side, 

 as usual, much more convex than anterior, two faces separated by 



Fig. 99. — Enchodus tttracus Cope. (Type, from Hay.) 



cutting-edges, both of which extend to base of crown. Shallow 

 groove runs just behind each cutting-edge to base, giving latter 

 an unsymmetrical figure 8 form of section. Anterior face but 

 little convex, perfectly smooth and posterior very convex, marked 

 with sharply defined grooves about half way to apex from base 

 between lateral shallow grooves. Fifteen may be counted from 

 side to side. Length of crown 30 mm. (From Cope.) 



