MOLLUSCA OR UNIVALVES. 223 



in the collection of Lord Tankerville, specimens 

 of which are extremely rare and valuable. 



88. Cancellaria. — Shell oval or turreted; 

 spire slightly elevated, and 

 pointed ; mouth oval, having 

 either a very short canal or a 

 notch only ; right lip sharp, 

 and wrinkled within ; left lip 

 with several irregular plaits; 

 operculum horny. Animal doubtful. — 12 

 species recent, and 7 fossil. 



These shells are generally found on the sands 

 of the shores washed by the Indian and African 

 seas, and on the coast of America: they are 

 rare, but not remarkable ; and are usually 

 rough to the touch, and striped. 



89. Fasciolaria. — Shell fusi- 

 form, and not very thick ; spire of a 

 moderate length; mouth oval; canal 

 rather long, sometimes slightly bent; 

 right lip sharp, and often wrinkled 

 inside ; left lip having two or three 

 oblique plaits ; operculum doubt- 

 ful. Animal unknown. — 8 species, 

 recent. 



