264 



NORTH-CAROLINA GEOLOGICAL SURVEY. 



They are associated together in about equal numbers. Neither 

 species are found in older beds. 



FIG. 142. 



FIG. 143. 



FIG. 130. 



FIG. 131a. 



FIG. 144. 



PLEUKCTOMA LUNATUM. LEA. TURRIS LUNATUM. FOSSILS OF 



SOUTH-CAROLINA. (Fig. 144.) 



Shell thick, elongate, acute, subfusiform ; strongly and 

 obliquely ribbed ; spire, eight whirled, angulated above and 

 ornamented by a narrow sutural band. 



The upper part of the whirls are construct 

 ed so as to present to the eye a narrow spiral 

 band. Rather common in the marl of Cape 

 Fear river. 



PLEUROTOMA LIMATULA. CON. (Fig. 145.) 



Shell rather small, sub-fusiform ; spire com 

 posed of five or six whirls ; whirls constricted 

 above and sub-angulated, forming a sutural 

 spiral collar ; ribs oblique and coarse. t It is 

 about one inch long. 



PLEUROTOMA COMMUNIS. CON. 



Shell small, sub-fusiform ; whirls about six, indistinct ; body- 

 whirl traversed spirally by four other sharp ridges. 



