810 CLASS XIII. 
Sp. Ancillaria cinnamonea Lam. (Bulla cyprea L. 1), &e. (A genus scarcely 
distinct from Oliva, of which perhaps it is to be regarded as a sub-generic 
section.) 
Oliva Bruc., Lam. Shell smooth, subcylindrial, convolute, 
polished, with spire short and sutures canaliculate. Aperture 
longitudinal, terminating in a sinus. Columella obliquely striated. 
Labrum somewhat thick, with margin inflected towards the aper- 
ture. Animal with foot elongate, furnished anteriorly with a 
triangular lobe, without operculum; tentacles incrassated at the 
base, oculiferous on the outside, attenuated at the apex. 
Sp. Oliva porphyria Lam., Voluta porphyria L., D’ARGENVILLE Conch. Pl. 
13, fig. K, Hncycl. méth., Vers. Pl. 361, fig. 4, Renve Conch. Syst. u. Pl. 
273, fig. 1 ;—Oliva maura Lam., Voluta Oliva L. (in part), Rumen. Amb. 
Rariteitk. Tab. 39, fig. 2, Cuv. R. Anim., éd. ill., Moll. Pl. 51, fig. 3, &e. 
The species are numerous, many much resembling each other, and on 
account of the manifold varieties which some present, difficult to distin- 
guish. There are also some fossil species known, which occur in the ter- 
tiary formations. 
Ovula Bruce. Shell involute, turgid, polished ; spire concealed. 
Aperture longitudinal, narrow, produced at both ends beyond the 
-columella, with columellar margin edentulous. Labrum often in- 
crassated, inflected, flat, transversely crenate. 
Sp. Ovula oviformis Lam., Bulla Ovum L., Rumpx. Amb. Rariteitk. Tab. 38, 
fig. Qa, Buatnv. Malac. Pl. 31, fig. 1; white, the outer margin of the mouth 
toothed, just as in Cyprwa, from which genus this species is in fact distin- 
guished merely by the smooth, convex inner margin. The animals, more- 
over, of the two genera are very similar. In other species the external 
margin is smooth; such is the case in Ovula volva Lam., Bulla Volva L., 
Buainv., 1. 1. fig. 3, where it terminates at both sides in a long tube. 
Cyprea L. Shell involute, polished, convex above, flattened 
at the aperture. Aperture straightened, longitudinal, effuse at 
both ends. Hither labium transversely crenate. Spire very small, 
concealed in adults. Animal with tentacles conical, the eyes 
placed externally at the base of tentacles, foot broad, operculum 
none; mantle very ample, reflected upon the shell at the sides. 
Porcelain shells. A very numerous genus (about 200 species are known), 
which is defined very naturally. The shell of the young animal differs 
much from that of the adult; it is thin, differently coloured and without 
teeth at the aperture, the wreaths also being then visible (see above, p. 
687, and compare the figure of Cyprewa exanthema in the young state, 
Encycl. méth., Vers. Pl. 349, or in Buainv. Malac. Pl. 30, fig. 2). 
