810 CLASS XIII. 



Sp. Ancillarla cinnamonea LAM. (Sulla cyprcea L. ?), &c. (A genus scarcely 

 distinct from Oliva, of which perhaps it is to be regarded as a sub-generic 

 section. \ 



Oliva BRUG., 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., Valuta porphyria L., D'AKGENVILLE Conch. PI. 

 13, fig. K, EncycL meth., Vers. PL 361, fig. 4, KEEVE Condi. Syst. n. PI. 

 273, fig. i ; Oliva maura LAM., Valuta Oliva L. (in part), RUMPH. Amb. 

 RariteitTc. Tab. 39, fig. 2, Cuv. R. Anim., ed. ill., Moll. PL 51, fig. 3, &c. 

 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 BRUG. 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., Sulla Ovum L., KUMPH. Amb. Rariteitk. Tab. 38, 

 fig. Q, BLAINV. Malac. PL 31, fig. i ; white, the outer margin of the mouth 

 toothed, just as in Cyprcea, 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., Sulla Volva L., 

 BLAINV., 1. 1. fig. 3, where it terminates at both sides in a long tube. 



Cyprma L. Shell involute, polished, convex above, flattened 

 at the aperture. Aperture straightened, longitudinal, effuse at 

 both ends. Either 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 Cyprosa exanthema in the young state, 

 EncycL meth., Vers. PL 349, or in BLAINV. Malac. PL 30, fig. 2). 



