MOLLUSCA 153 



not hitherto reported north of North Carolina. It 

 occurs in considerable numbers near the mouth of 

 Delaware Bay and elsewhere in southern New 

 Jersey. 



Divarcella quadrisulcata D 'Orbigny 



(Dollar a Dozen) 

 (Lucina dentata Wood) 



PLATE XIV. Fig. 10 



Shell up to about 1 inch in length, with well 

 marked concentric lines crossed by a series of wavy 

 lines. This shell is frequently found on beaches 

 along the whole length of New Jersey from Sandy 

 Hook to Cape May, but has never been seen alive in 

 New Jersey waters. It is said to live in from 10 to 

 30 fathoms between Massachusetts and Brazil; it is 

 much more common, and the shells are much fresher 

 in appearance south of New Jersey; it is probable 

 that many of the New Jersey shells are fossils. 



Laevicardium mortoni Conrad 



(Heart Shell; Smooth Cockle) 

 (Cardium mortoni Conrad) 



PLATE XIV. Fig. 6 



A smooth white, somewhat heart-shaped shell, 

 seldom more than an inch in length and about the 

 same in height ; hinge typical of the genus with two 

 teeth in the center and one lateral tooth on each side 

 and some little distance from the center (beak). 



A rather rare shell which occasionally can be 

 found burrowing in the sand or mud in shallow 



