246 



NORTH-CAROLINA GEOLOGICAL SURVEY. 



FIG. 101. 



BELEMNITELLA AMERICANA. (Fig. 101.) 



The belemnitella is sub-cylindrical and tapering to a point 

 from its base. The sides are marked by numerous ramose 

 furrows, though they are arranged without much order, and 

 being crowded they give the surface a granulated appearance. 

 The base has a fissure which extends through the wall to 

 a conical chamber. On the back, there is an ele- 

 vated convex surface, narrow toward the- base, 

 but widens towards the apex, where it is lost. 



This genus presents a great variety in form and 

 size ; but the foregoing characters are its constant 

 characteristics. It occurs at Black Rock and 

 Rocky Point, and is one of the characteristic fos- 

 sils of the green sand. It is 

 found also in the miocene beds, 

 but is there by accident. 





FIG. 103. Fia. 102. 



Fio. 105. FIG. 104. 



BELEMNITELLA COMHRESSA. N. 8. 



(Fig. 102.) 



Shell slender, transverse sec- 

 tion elliptical at base, and it be- 

 comes gradually more flattened 

 to its apex ; the fissure of the 

 base is short ; surface uneven 

 and somewhat irregular. This 

 species is entirely destitute of 

 the granulations, or the convex 

 surface of the preceding species. 

 The green sand of North-Caro- 

 lina is poor in cephalopods. I 

 have not yet observed either an ammonite 

 or nautilus, though they occur sparingly in 

 the eocene. 



In the eocene of Craven county I found 

 numerous specimens of the bony or horny 

 cores of the jaws of cephalopods. I have 

 not been able to determine the family to 

 which they belong. Fig. 104 represents their 

 form and size. They occur only in the up- 



