244 POPULAR CONCHOLOGY. 



mal, head furnished with a proboscis, and two 

 tentacula having eyes in the middle ; 

 foot short. — 5 species, recent. 



The shells of this genus are found 

 in the Indian and Chinese seas. The 

 Eburna Zeylanica is remarkable 

 for the little spines with which 

 the umbilicus is filled, and this 

 peculiarity distinguishes it from the other species 

 which are destitute of them. The Eburna gla- 

 brata very closely resembles the Ancillaria*, 

 in having the spire exceedingly smooth, and 

 the sutures not in the least channelled; it 

 differs, however, in having an umbilicus. 



111. Terebra. — Shell long, turreted, and 

 slender ; spire pointed ; whorls often 

 strongly marked at the upper part, 

 resembling a double suture; mouth 

 oval and strongly notched; no epi- 

 dermis nor operculum. Animal, head 

 not furnished with a proboscis, but 

 fringed, and having two tentacula 

 with eyes at the base; foot oval. — 

 24 species recent, 2 fossil. 



* It is now placed in that genus. 



