248 



of the Strombus; which is only distinguished from 

 this genus by the short canal, and the want of digita- 

 tions. Shell oval, oblong, ventricose ; spire short, and 

 generally concealed by the expanded mouth or lip. 



Lamarck uses the word, digitations, generally, for 

 that which, in some species of this genus, may more 

 properly be called Jong recurved claws, whence the 

 trivial name of Spider or Scorpion, applied to these 

 shells. In young examples these digitations are not 

 visible. Seven species are here enumerated, but an- 

 other, the P. purpurea, is described, and, with other ex- 

 amples of this genus, admirably figured by Swaiuson 

 in his Exotic Conchology; the writer has also seen 

 one quite distinct from any of these, though resem 

 bling in many respects the P. millepeda. 



Pterocera truncata Pterocera pseudoscorpio 



lambis scorpio 



millepeda aurantia 



Pterocera chiragra. 





1 



STROMBUS. 



STROMBUS GIG AS. LinncCUS. 



Mawcs Linn, pi 25, fi<). Q, 3. 

 The genus Strombus, as it now stands defined by La- 



