52 CRETACEOUS AND TERTIARY FISH. 



very elongate. The root is excessively protuberant, projecting 

 horizontally beyond the convex side, and flat or truncate below 

 the protuberance. The enamel is entirely smooth. Measure- 

 ments of the New Jersey specimen: Length of crown, 14 mm.; 

 diameter of base, longitudinal, 4 mm. ; transverse, 7 mrn. ; long 

 diameter of roots at basis of crown, 8 mm. (From Cope.) 



The above description seems to be all that is known of this 

 species in New Jersey. 



Formation and locality. As given above, these fossils are Cre- 

 taceous. 



Lamna texana Roemer. 



Lamna sp. Leidy, Proc. Acad. Nat. Sci. Phila., 1872, p. 166. (New Jersey 

 Cretaceous.) 



Lamna texana Leidy, Rep. U. S. Geol. Surv. Terr. Hayden, 1873, p. 304, PI. 

 18, figs. 46-47. (Clay near Haddonfield, in Camden Co., and Cre- 

 taceous greensand of Mullica Hill, in Gloucester Co.) 

 Cope, Rep. U. S. Geol. Surv. Terr. Hayden, II, 1875, p. 296. (Greensand 

 No. 4 of New Jersey.) 



Anterior teeth long, slender, compressed, scarcely sigmoid in 

 profile. Crown slender, moderately thickened, erect. Outer 

 coronal surface flattened or but slightly convex, and smooth. 

 Inner coronal surface convex, sometimes little depressed basally, 

 and marked at least over greater extent basally with prominent 

 vertical striae. These striae more sparse than in related species. 

 Apex erect, scarcely deflected. Cutting-edges prominent, entire. 

 No basal cusps. Root large, outer surface concavely depressed, 

 and inner bulging in prominent convexity, usually with more or 

 less complete sulcus. Branches of root usually long, moderately 

 divergent, and angle between usually well marked. Length 

 reaches 48 mm. 



Leidy first notices the two teeth ascribed to this species from 

 clay near Haddonfield, which he found with a skeleton of Hadro- 

 saurns foulkii and shells of Bxogyra costata, Ammonites pla- 

 centa, etc. This species is only known from detached teeth, and 

 may be distinguished from Lamna elegans by the coarser striae 

 on the outer coronal surface. 



Formation and locality. Known from the Cretaceous. I have 

 26 teeth froirii Mullica Hill [Navesink^Hornerstown marl, K.] 



