230 



NORTH-CAROLINA GEOLOGICAL SURVEY. 



convex, outer nearly flat, and slightly champered towards 



FlG - 54 - the edges, and also slightly 



convex near the middle ; ser- 

 atures small, root thick, stout 

 and straight across the base, 

 and sloping on the inner face. 

 The form of this tooth diifers 

 materially from the megalod- 

 on, especially in the relations 

 of its height and breadth ; 

 height, four inches and a half, 

 breadth at base, five inches ; 

 thickness of the root, one inch 

 and a half, measured over the 

 slope ; length from the apex to 

 the base of the root, five inch- 

 es, measured along the edge ; 

 thickness at the middle, one 

 inch. Found in the eocene of 

 Craven county, JST. C. The 

 dimension of this species of 

 shark equals that of the car- 

 charodon megalodon. The 

 tooth is thicker and stouter 

 than this species, and more 

 convex posteriorly, straighter 

 across the base, and propor- 

 tionally wider. Fig. 52 shows 

 the outline of the tooth, fig. 54 

 is an edge view, and figure 53 

 a transverse section, showing 

 convexity of the inferior face, and the flatness of the superior. 



CARCHARODON STJLCIDENS. AGASS. (FigS. 55 & 56.) 



Teeth large, thin and pointed ; their forms correspond very 

 closely to that of an isosceles triangle. They are flat on one 

 side ; the enamel extends to the root on both sides ; it is more 

 regularly sulcated upon the convex than upon the other side ; 

 fig. 55 young of the sulcidens. 



