MOLLUSCA 183 



common along the rest of the New Jersey coast. 

 The species is known from Prince Edward Island 

 to Florida, and is particularly abundant in Long 

 Island Sound, Delaware Bay and Chesapeake Bay 

 where it feeds on young' oysters. 



Eupleura caudata Say (Oyster Drill; Drill; Borer) 



Fig. 30 C 



Flatter in appearance than Urosalpinx but simi- 

 lar to it in habits and distribution, although not 

 nearly as common. Of some 10,000 borers taken 

 from Delaware Bay by the New Jersey Oyster In- 

 vestigation Laboratory in one season, 3% proved 

 to be this species, the other 97% being Uroscdpinx. 



Thais floridana Conrad 



(Purpura haemastoma floridana Conrad) 



PLATE XX. Fig. 7 



Although not known alive north of North 

 Carolina, the shell is occasionally found on New 

 Jersey beaches where they have probably been 

 washed from some fossil deposit. 



In southern waters where this species abounds, 

 they cause considerable damage to oysters by drill- 

 ing holes in the same manner as Uroscdpinx and 

 Eupleura. 



