286 



NORTH-CAROLINA GEOLOGICAL SURVEY. 



the coast. A. limatula and stillicidium are also miocena 

 shells, and common in the marl beds of the Cape Fear river. 



FIQ. 206. 



VERTICORDIA. WOOD. (Fig. 206.) 



I have met with two or three specimens only 

 of the fossil which I have referred to this genus. 

 It is found in the interior of large shells. 



GENUS PECTUNCULUS. 



Shell orbicular, nearly eqilateral, smooth and 

 radiately striated ; hinge with a semi-circular row of trans- 

 verse teeth. 



PECTUNCULTJS SUBOVATUS. (Fig. 207.) 



Shell orbicular, inequilateral, with radiating sulci, becom- 



FIG. 207. 



ing obsolete with age ; teeth nearly obliterated in the centre ; 

 teeth largest on the shorter side of the valve ; marginal ones 

 broad and separated ; Conrad. This is probably one of the 

 most common miocene fossils of the shell marl in the State. 



P. LENTIFORMIS. 



Shell orbicular, sub-equilateral ; the radiating striae are nu- 

 merous ; beaks small in proportion to the size of the shell ; 

 hinge teeth in the centre, wanting or obsolete. This fine spe- 

 cies in some marl beds upon the Cape Fear, is quite common, 

 and is very large and thick ; some are four to four and a half 

 inches across. 



