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 differs 

 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, ]ST. 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 STJLCTDENS. 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. 



