408 MULLUSCA : GASTEROPODA. 



FIG. 552. 



FIG. 553. 



Strombus pugilis, L. One half. 

 West Indies. 



Aporrhais occidentalis, Beck. New England. 



Those prosobranchiates which have tlie shell with the 

 aperture notched, or prolonged into a sort of canal in 



FIG. 554. 



FIG. 555. 



1'yrula canaliculate!. Linn. Reduced. 

 Uuited States. 



Murex tenuispina. Lamarck. 

 Reduced. 



