GASTEROPODA PF.CTINIBRANCH IATA. 67 



:uiiinal has a broad foot, an extended mantle which partly folds over 

 the shrll, a moderate and obtuse 8nout, and two long tentacula, on 

 which, at about the third of their length, are the eyes. 



Montfort particularly designate, hy the term OVUL^, those in 

 which the external margin is transversely sulcated *. 



Those in \\-hich the two extremities of the aperture are prolonged 

 into a canal, and in which the external margin is not sulcated, he 

 calls NAVBTTES VoLV^f- 



When this external margin is not sulcated, nor the extremities of 

 the aperture prolonged, he styles them CALPURN*:}. 



TEREBELLCM, Lam. 



An oblong shell, with a narrow aperture, without plicae or wi inkles, 

 and increasing regularly in width to the end opposite the spire, which 

 is more or less salient, according to the species . The animal is not 

 known. The 



VOLUTA, Lin. 



Varies as to the form of the shell and that of the aperture, but is 

 recognised by the emargination without a canal which terminates it, 

 and hy the salient and oblique plicae of the columella. From this 

 genus Brugieres first separated the 



OLIVA, Bniy. 



So named from the oblong and elliptical shape of the shell, the 



aperture of which is narrow, long and emarginated opposite to the 



spire, which is short; the plicae of the columella are numerous, and 



nible striae ; the whorls are sulciform. These shells are quite as 



beautiful as the Cypraeae||. 



The animal has a large foot, the anterior part of which (before the 

 head) is separated by an incision on each side ; its tentacula are 

 slender, and the eyes are on their side about the middle of their length. 

 The proboscis, siphon and penis are tolerably long; but it has no 

 oprrculum. MM. Quoy and Gaymard have observed an appendage 

 on its posterior portion, which enters the sulcus of the whorls. 



The remainder of the genus Voluta was afterwards divided into 

 five, by M. de Lamarck ^[. The 



VOLVARIA, Lam., 

 Closely resembles the Oliva in its oblong or cylindrical form ; but 



Bullawum, L., List., 711, 65, Encyclop., 358, 1. 



t Hulta ro/ra, L., List., 711, 63, Encycl., 357, 3 ; B. Wrorfru, Encycl. 357, 1 ; 

 Sowerb., Ib. 



J nulla rfi-rucosa, L., LUt., 712, 67, Encyc., 357, 5. from which we do not sepa- 

 rate the ULTIMA, Montf. : or Bulla gibbosa, L., List., 711, 64, Encyc. 357, 4. 



Terebtllum subulatum, Lam., HulUt trrebtlluM, L. List., 736, f. 30, Encyc., 360, 

 -cb. conro/u/um, Lam., Sowerb., Gen. of Shells, No. \ I. 



|| OJir. sitbulata, Lam., Encyc., pi. 3fi8, f. 6, a, b\ Vol. hiatula, L. ; Vvl por- 

 phyria, Vol. o/iru, and, in general, all the cylindrical VoluUe of Gmel., p. 3438, 



Ct scq. 



1T Exclusive of the Tornatcll* and Pyramidclla already mentioned. 



F 2 



