5o 



CRETACEOUS AND TERTIARY FISH. 



Fig. i". — Lamna elegans Agassiz. i, New Jersey (Cope) ; 2, Monmouth 

 Co. (Knieskern) ; 3, Pemberton (Budd) ; 4-6, Vincentown (Slack) ; 7-12, 

 Vincentown (Bryan). 



or each side. Root large, outer face concavely depressed, and 

 inner convexly bulging till very pronounced, the convexity usually 

 with more or less complete sulcus. Branches of root usually long, 

 moderately divergent, and angle between branches usually well 

 marked. Lateral teeth with lower crowns, often well deflected, 

 wider angle between branches of root and basal cusps varying till 

 quite broad. Length to 65 mm. 



This well-marked species is easily distinguished, when not 

 worn, from the other species of the genus by the fine vertical 

 striae in the inner coronal surface. It is quite variable, and in 

 the variation of form closely resembles Lamna cuspidata. 



