26 



CRETACEOUS AND TERTIARY FISH. 



Teeth awl-shaped, rather sigmoid, without any basal cusps, 

 roots unequal or nearly equal and approximated. 



Originally this genus was thought to be of uncertain relation. 

 Woodward has suggested its relation with Heptranchias, point- 

 ing out that the teeth are apparently referable to the symphysis 

 of the upper jaw of that genus 1 . Provisionally, at least, I retain 

 it as distinct. 



Xiphodolamia ensis Leidy. 



Xiphodolamia ensis Leidy, Journ. Acad. Nat. Sci. Phila., (2) VIII, 1877, 

 p. 252, PI. 34, figs. 25-30. Vincentown, Monmouth County, Burlington 

 County, Allowaystown, N. J. 



Teeth slender, compressed laterally. Crown smooth, usually 

 sigmoid, sabre-like in form, front edge sharp and hind border 

 obtuse. Outer surface flat, inner convex. Cutting-edge entire. 

 Apex erect, slender, sharp-pointed. No cusps. Root with both 

 sides apparently approximated, so that ends are directed ob- 

 liquely and parallel, and these sometimes nearly equal. Outer 



Fig. 2. — Xiphodolamia ensis Leidy. 1, Allowaystown (Yarrow) ; 2-5, Mon- 

 mouth Co. (Knieskern) ; 6, Burlington Co. (Abbott) ; 7-8, Vincentown 

 (Bryan). 



surface depressed or concave, and inner bulging convexly, though 

 inferiorly, inner surface also slopes down flattened. Length 

 28 mm. 



This species is known only from the above described paratypes. 



Formation and locality. I have examined Leidy's paratypes, 

 doubtfully ascribed to the Cretaceous? of New Jersey. They 



1 Cat. Foss. F. Brit. Mus., I, 1899, p. 168. 



