GASTEROPODA PECTINIBRANCHIATA, 67 



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

 the shell, a moderate and obtuse snout, and two long- tentacula, on 

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



Montfort particularly designates, by the term OvuLiE, those in 

 which the external margin is transversely sulcated *. 



Those in which the two extremities of the aperture are prolonged 

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

 calls Navettes VoLV.ijf. 



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

 the aperture prolonged, he styles them Calpurn^eJ. 



TerebeLlum, Latn. 



An oblong shell, with a narrow aperture, without plicce or wrinkles, 

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

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

 known. The 



VoLUTA, Lhi. 



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

 genus Brvigieres first separated the 



Oliva, Brug. 



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 plicee of the columella are numerous, and 

 resemble strioe ; the whorls are sulciform. These shells are quite as 

 beautiful as the Cypra:se||. 



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

 operculum. MM. Quoy and Gaymard have observed an appendage 

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



The remainder of the genus "V^oluta Avas afterwards divided into 

 five, by M. de Lamarck^f. The 



VoLvARiA, Lam., 

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



* Bulla ovum, L., List., 711, 65, Encyclop., 358, 1. 



t Bulla volva, L., List., 711, 63, Eucycl., 357, 3 ; B. birosfris, Encycl. 357, 1 ; 

 Sowerb., lb. 



X Bulla i-erru.cosa, L., List., 712, 67, Encyc, 357, 5. from which we do not sepa- 

 rate the Ultimo, Montf. : or Bulla gibbosa, L., List., 711, &4, Encyc. 357, 4. 



§ Terehelhim subulatum, Lam., Bulla terebellvm, L. List., 736, f. 30, Encyc, 360, 

 1 ; — Tereb. convolufum, Lam., Sowerb., Gen. of Shells, No. VI. 



II Olii\ subulata, Lam., Encyc, pi. 368, f. 6, a, b ; — Vol. hiafula, 'L. ; — Vol por- 

 Ijhyria, Vol. oliea, and, in general, Eill the cylindrical Volutae of Gmel., p. 3438, 

 et seq. 



*f Exclusive of the Tornatellee and Pyramidella already mentioned. 



p2 



