156 ANIMALS OF THE SEASHORE 



coast. This species, made up of three varieties, is 

 known from Labrador to the Gulf of Mexico. 



Pitar morrhuana Gould 



(Cytherea convexa Say; Callocardia morrhuana Gould) 



PLATE XV. Fig. 8 



Closely resembles Venus mercenaria, but rarely 

 grows larger than. 2 inches; shell smoother and with 

 no purple marks on the interior; hinge has both 

 lateral and cardinal teeth. 



Lives in shallow water from Nova Scotia to 

 Florida; not uncommon on New Jersey beaches but 

 more abundant farther south. 



Petricola pholadiformis Lamarck (Angel Wings) 



PLATE XIV. Fig. 9 



Shell thin, white, with numerous ribs; about 

 2 inches in length; when spread open resembles 

 a pair of wings, hence the name. It burrows to 

 the depth of about 6 inches in mud or hard clay 

 offshore or near salt marshes. Frequently after 

 storms large clumps of old meadow sod or peat 

 are washed ashore from below low tide line, 

 and are found to contain these mollusks. After 

 a storm at Cape May Point, N. J. (September 20, 

 1928), a log was washed ashore containing a large 

 number of individuals of this species associated with 

 Pholas truncaia and Teredo (Ship Worm). 



Known from Prince Edward Island to the Gulf 

 of Mexico, boring in clay or peat. 



