227 



models of innumerable designs for ornamenting archi- 

 tectural columns. The aperture is short, oblong, and ob- 

 lique, terminated at the base by a short canal, trunca- 

 ted and recurved backwards, never with a notch ; at the 

 upper part of the opening is a gutter or groove, more 

 or less strongly defined in the different species. They 

 inhabit the sea, but such as have the canal straight and 

 truncated, inhabit salt marshes, or the embouchure 

 of rivers, where the sea joins the fresh-water: they 

 are not however river shells, and do not offer suffici- 

 ently strong characters to constitute a genus of them- 

 selves; nor has Lamarck thought it necessary to make 

 even a division of them, which might probably have 

 been advisable. 

 Cerithium giganteum Carithium erythraeonense 



palustre muricatum 



sulcatum radula 



•'•••: telescopium crassum 



ebeninum decollatum 



nodulosum obtusum 



vulgatum semigranosum 



obeliscus asperum 



granulatum lineatum 



aluco vertagus 



echinatum fasciatum 



<i2 . 



