GASTEROPODA PECTINIBRANCIIIATA. 
67 
animal lias a broad foot, an extended mantle which partly folds over 
the shell, a moderate and ohtuse snout, and two long tentacula, on 
which, at about the third of their length, are the eyes, 
Montfort particularly designates, by the term OvuljE, those in 
Avhich 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^f* 
When this external margin is not sulcated, nor the extremities of 
the aiierture prolonged, he styles them Calpurn^I. 
Terebellum, Low?. 
An oblong shell, with a narroAv aperture, without plicie 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 
knoAvn, The 
VoLUTA, Lin. 
Varies as to the form of the shell and that of the aperture, but is 
recognised by the emargination Avithout a canal Avhich terminates it, 
and by the salient and oblique plicae of the columella. From this 
genus Brugieres first separated the 
Oliva, Brvg. 
So named from the oblong and elliptical shape of the shell, the 
aperture of Avhich is nari'OAV, long and emarginated o])posite to the 
spire, Avhich is short; the plicae of the columella are numerous, and 
resemble striae ; the Avhorls are sulciform. These shells are quite as 
beautiful as the Cypraeae||. 
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 postei’ior portion, Avhich enters the sulcus of the Avhorls. 
The remainder of the genus Voluta Avas aftei’Avards divided into 
five, by M. de Lamarck^. The ‘ 
VoLALARiA, Lam., 
Closely resembles the Oliva in its oblong or cylindrical form ; but 
*■ Bulla ovum, L., List., 711, 65, Eiicyclop., .358, 1. 
f Bulla volva, L., List., 711, 63, Encycl., 357, 3 ; B. hiroslris, Eiicycl. 357, 1 ; 
Sowerb., Ib. 
J Bulla verrucosa, L., List., 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. 
§ Terebellum subulatum, Lam., Bulla terebellum, L. List., 736, f. 30, Encyc., 360, 
1 ; — Tereb. convolutum, Lam., Sowerb., Gen. of Shells, No. VI. 
II Oliv. subulata, Lam., Encyc., pi. 368, f. 6, a, b ; — Vul. hiatula, L. ; — Vol por- 
phyria, Vol. oliva, and, in general, all the cylindrical Volutae of Gmel., p. 3438, 
ct seq. 
^ Exclusive of the Tornatellce and Pyramidellte already mentioned. 
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