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UNIVALVES. — STROMBUS. 



STROMBUS.— Winged or Claw-Shell. 



Animal— a Limax: Shell univalve, spiral; aperture mnch 

 dilated; the lip expanding, and produced into a groove 

 leaning to the left. 



The distinguishing character of this genus, ofwhicli there 

 are fifty-three species, consists in the position of its beak, 

 which inclines to the left instead of the right; however, 

 as the younger shells of the genus are sometimes wholly 

 destitute of any beak whatsoever, a confusion with many 

 other genera has often taken place. 



Almost the whole of this genus seem to have a propen- 

 sity to extend their outer lip, either into the form of an 



