82 



CRETACEOUS AND TERTIARY FISH. 



The two fragmentary examples I have, evidently of this species, 

 both show their front and hind edges convex. Cope pointed out 

 this character originally, adding that both edges were also curved 

 to the tip, though one curvature greater than the other. Further, 



Fig. 39. — Pristis amblodon Cope. 1-4, Monmouth Co. (Cope) ; 5-6, Pem- 

 berton (Bryan). 



he says the teeth are not curved out of the horizontal plane, and 

 his example measured 32 mm. 



Formation and locality. Two examples described above, ros- 

 tral teeth from Monmouth County (E. D. Cope), are credited 

 by Cope to the New Jersey Eocene. 



Pristis curvidens Leidy. 



Pristis curvidens Leidy, Proc. Acad. Nat. Sci. Phila., 1855, p. 414. Near Pem- 

 berton, N. J. } Greensand. 



Teeth of rostrum well compressed. Front margin evenly con- 

 vex and surface smooth. Hind margin slightly concave, some- 

 times a little oblique on sinistral surface, and each edge distinct 

 or a trifle trenchant or keeled. Distal edge of front margin more 

 suddenly convex than hind margin, and convexity of former 

 begins more distally. Teeth nearly or quite level in horizontal 

 plane to well decurved. Length reaches 96 mm. 



This species seems to be characterized chiefly by having its 

 rostral teeth considerably curved downward. The type was 

 about 22 cm. long. 



Formation and locality. The following examples in the col- 

 lection of the Academy, all rostral teeth, have been examined; 

 Monmouth County 1 (P. D. Knieskern) ; Burlington County 1 



