NORTH-CAROLINA GEOLOGICAL SURVEY. 



267 



NATICA CANRENA. Fig. 152. 



Shell rather thick, lines of growth surrounding the spire, 

 very distinct, resembling wrinkles ; umbilicus partially closed 

 with callus. 



Occurs frequently in the miocene marl of North-Carolina. 



FIG. 151. 



FIG. 153. 



FIG. 149. 



NATICA FRAGILIS. (Fig. 153. 



Shell small, surface marked by revolving lines and lines of 

 growth, which give it a cancellated appearance. 



