150 CONCHOLOGY. 



O. verrucosa. O. gibbosa. 



O. spelta. O. volva. 



O. angulosa. O. lactea. 



O. hordacea. O. triticea. 



O. birostris. O. acicularis. 



3. Genus Terebellum. PI. XII. 



Animal. Entirely unknown. 



Shell. Thin, shining, subcylindrical, involute, pointed poste- 

 riorly, truncated anteriorly ; aperture longitudinal, triangular ; 

 edges entire ; columella truncated, and prolonged beyond the aper- 

 ture. Inhabits the Indian Ocean. Three living species and tvsro 

 fossil. 



Terebellum subulatum. Terebellum convolutum. 

 T. fusiforme. 



4. Genus Jlncillaria. PI. XII. 



Animctl. Unknown. 



Shell. Smooth, oval, oblong posteriorly, widened and trun- 

 cated anteriorly; aperture oval, somewhat elongated, angular 

 posteriorly ; a wide but not deep slope anteriorly ; columella 

 covered anteriorly with an oblique callous band ; right lip obtuse, 

 Inhabits the Australian seas. Four living species, and five 

 fossil. 



Anciilaria cinnamonea. Ancillaria Candida. 



A. ventricosa. A. marginata. 



5. Genus Oliva. PI. XII. 



Animal. Oval, involute, mouth somewhat thin at its edges, 

 prolonged to the two angles of the branchial aperture in a tenta- 

 cular band, and, anteriorly, by a long branchial tube ; foot very 

 large, oval, subauriculated, with a transverse cleft anteriorly ; 

 head small, with a labial proboscis. 



Shell. Thick, solid, smooth, oval, elongated, subcylindrical ; 

 the whorls of the spire very small, and separated by a canal ; aper- 

 ture long and narrow, the columellar edge dilated anteriorly by a 



