218 POPULAR CONCHOLOGY. 



at the extremity, and having eyes at the base; 

 an operculum. — 13 species recent, and 12 fossil. 



These shells are found in India, Africa, and 

 Europe ; and many of the foreign species attain 

 a large size, some having been found four inches 

 and a half long. They are all marine, more or 

 less striated; but none of the species known 

 possess vertical ribs, thickened bands, or tu- 

 bercles. The right lip is seldom perfect, and 

 the sinus therefore not always visible. 



Division II. — Zoophaga. 



The Zoophaga, or carnivorous Trachelipods, 

 are divided into five families : — Canaliferidce, 

 Pteridce, Purpuridce, Columellidce, and Convo- 

 lutidce. They all form the mouth of the shell 

 with a notch or canal at the lower extremity, 

 for the convenience of protruding a retractile 

 trunk, with which they pierce the substance 

 of other shells, and suck out the contents. It 

 is this formation of the mouth which distin- 

 guishes the shells from those of the herbi- 

 vorous members of the order, it being in the 



