150 CONCHOLOGY. 
QO. verrucosa. . gibbosa. 
O. spelta. . volva. 
O. angulosa. . lactea. 
O. hordacea. 
O. birostris. 
. triticea. 
. acicularis. 
© O-O7e7e 
3. Genus Terebellum. Pl. 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 two 
fossil. 
Terebellum subulatum. Terebellum convolutum. 
T. fusiforme. 
4. Genus Ancillaria. Pl. XII. 
Animal. 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. 
Ancillaria cinnamonea. Ancillaria candida. 
A, ventricosa. A. marginata. 
5. Genus Oliva. Pl. XII. 
Animal. Oval, involute, mouth somewhat thin at its edges, 
prolonged to the two angles of the branchial aperture in a ten ta- 
cular band, and, anteriorly, by a long branchial tube ; foot very 
large, oval, subauriculated, with a transverse cleft anteriorly ; 
head smail, 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 
