TEREBRA. 



which increase gradually in size; aperture seldom 

 exceeding one-third of the length of the shell, for the 

 most part much shorter, oblong, with a short straight 

 canal at the base ; columella oblique and spiral or twisted, 

 often striated. 



The recent species of this Genus are numerous, we 

 possess about an hundred ; some of them are very beauti- 

 ful : they are principally brought from the East and West 

 Indies, and from South Africa : very few are European. 

 Several fossil species occur in the newer formations, at 

 Piacenza, Bordeaux, Turiu, &c. they are more scarce in 

 the London clay. 



