MOLLUSCA 151 



posteriorly into an upturned tip which gapes to 

 accomodate two little siphons. 



P. gouldiana is found in shallow water on sandy 

 bottom from Prince Edward Island to North Caro- 

 lina. The southern form P. triliTieata Say, known 

 from North Carolina to the Gulf of Mexico, differs so 

 slightly from the northern form that it seems probab- 

 le that they should be regarded as the same species. 



Pandora, while not common in New Jersey, is 

 fairly numerous in a few places, particularly in parts 

 of Delaware Bar. 



Lycnsia hyalina Conrad 



PLATE XIV. Fig. 11 



Shell pearly and transparent, a little less than 

 1 o inch long with the left valve slightly larger than 

 the right. Anterior end rounded, posterior end 

 elongate. Lives in shallow muddy water from the 

 Gulf of St. Lawrence to Texas. In New Jersey it is 

 known from Barnegat and Delaware Bays; not com- 

 mon. 



Cyprina islandica Linne 

 (Arctica islandica Linne \ 



PLATE XIX. Fig. 4 



A large clam up to 4 inches in length easily 

 recognize;! by its thick wrinkled black epidermis; 

 usually lives in dee]) water ((MX) fathoms) and is 

 occasional but not common on the New England 

 beaches after storms. Known from New Jersey by 

 only one record, 20 miles southeast of Atlantic City. 



