CONCHOLOGY. ^ 147 



tinct folds. Inhabits the Indian Ocean. Twenty-four living 

 species and nine fossil, according to Defrance. 



Marginella radiata. Marginella nubeculata. 



M. limbata. " M. aurantia. 



M. lifasciata. M. longivaricosa. 



M. dentifera. M. eburnea. 



M. bullata. M. persicula. 



M. avellana. M. tessellata. 



M. glabrella. M. caerulescens. 



M. quinqueplicata. M. bivaricosa. 



M. rosea. M. muscaria. 



M. faba. M. formicula. 



M. dactylus. M. lineata. 



M. cornea. M. interrupta. 



5. Genus Volvaria, PI. XII. 

 Animal. As above. 



Shell. Cylindrical, convolute ; spire obsolete or concealed ; 

 aperture narrow, extending the whole length of the shell, with 

 one or more folds on the lower portion of the columella. Inhabits 

 the Indian Ocean. Seven species. 



Volvaria pallida. Volvaria triticea. 



V. monilis. V. oryza. 



V. miliacea. V. bulloides. 



V. canaliculata. 



FAMILY XXI. 



CoNvoLUTA. Six genera. 



1. Genus Ctjprsea. PI. XII. 



Animal. Oval, elongated, involute ; head provided with two 

 very long conical tentacula ; eyes at the extremity of an inflation 

 which forms a part of them ; a transverse buccal orifice at the ex- 

 tremity of a kind of cavity, at the bottom of which is the true 

 mouth between two thick vertical lips ; a lingual band, bristled 

 with small teeth, and prolonged into the abdomen. 



