100 



POPULAR CONCHOLOGY. 



eyes at the base on a thickening ; very like Paludina, but 

 having two dissimilar gills. — About 12 species ; also 

 fossil. 



These Mollusca are found in India, South America, and 

 the Isle of France, where they abound, sometimes almost 

 covering the shores in particular spots ; they are often 

 concealed under stones. Some of the shells are transversely 

 grooved on the exterior, but do not possess much beauty. 



QiJOYA. Deshayes, (Leucostoma Sw.) — Shell turret- 

 shaped, often decollated ; aperture large, notched ; the 

 columella on the upper part has a fold at right angles to 

 it, otherwise it does not differ from Planaxis. Animal 

 outwardly like that of Planaxis. — 1 species. 



Qaoya (Planaxis) decollata is from New Guinea. 



Macrocheilus. Phillipps. — Shell thick, ventricose, 

 like a Buccinum ; aperture simple, effuse below ; outer lip 

 thin, inner wanting ; columella callous, slightly tortuous.* 

 — 12 species fossil. 



Holopea. Hall. — Shell conical, ventricose, more or 

 less oblique, or nearly straight ; aperture roundish oval ; 

 the lips entire, the outside marked with lines of increase, 

 or cross-barred. — Fossil. 



Shell greatly resembling Paludina. 



RlSSOA. Freminville. (Cingula Flem. ; Loxostoma 

 Bivona.) — Shell small, of various colours, oblong, i 

 turreted ; no umbilicus ; generally remarkable for its M 

 longitudinal bands, but sometimes spirally grooved, f 

 or even smooth ; aperture oval, oblique ; the two lips W 

 united, the right not reflected, but thickened ; a horny S(3 "* 

 operculum of few whorls. Animal, having a produced, 

 muzzle-shaped head, with two long setaceous tcntacula, 

 bearing eyes on protuberances near their external bases : 



Woodward's Recent and Fossil Shells. 



