NORTH-CAROLINA GEOLOGICAL SURVEY. 



238 



FIG. 59, a. 



each side of this line they are quite flat ; enamel thin, serra- 

 tures small, root thick, striated and heavy, with a very low 

 arch. 



This tooth scarcely exhibits the usual convexities of either 

 face ; the faces being bounded by plane surfaces, the meeting 

 of which give an obtuse angle when obtained by a central 

 section through the crown. It belongs to the eocene, and was 

 obtained from a bed near JNTewbern. 



C. CRASIDENS, N. S. (Fig. 59, a.) 



Tooth sub-conical, thick, slightly oblique ; inner face very 

 convex, outer flat at base, evenly but flatly convex near the 



apex, with an inconsiderable 

 ridge extending from the 

 base to a point near the apex, 

 and somewhat ridged across 

 the whole of the base of the 

 outer face ; serrae, sub-equal, 

 and armed with serrate wings 

 at base ; root thick and pro- 

 minent on the inside ; en- 

 amel extends on the outer 

 face to the root, and is ex- 

 tended continuously over the 

 wings. This tooth belongs 

 to the eocene at Wilmington. 

 It is distinguishable from oth- 

 er teeth belonging to this 

 order of fishes, by its very 

 uniform degree of thickness 

 from the base of the root, 

 near its termination, at the apex. 



CARCHARODON CONTORTIDENS. N. S. (Fig. 60.) 



Tooth an irregular cone, with the crown twisted near the 

 summit; base of the root nearly plane, with the branches 

 projecting upwards, rather than downwards, so much so as to 

 stand upright when placed upon its base; inside the base 



