>G4 



MOLLUSCA. 



less coated Willi a vitreous covering or enamel -I ike ijlaze, pi'obaljly secreted by the mantle. The colnnirllfi is 

 uniformly ciii-\('(l. and it is believed that none of the species liave liitherto been found in the New \'/(jild," — 

 Broih-r'i}!.'] ['Hie Mi:lo, Broderip, resembles Cymba; but its apex, instead of beings shapeless and rude, takes a 

 well-fashinned nnd spirally-marked form. The colouring; of the shell is also more elegant and vi\'id.] 'Jtbers 

 (Volida, IMontf.) have the last whorl conoid, narrowing- at the end opposed to the spire. Tlie foot is less lliaii in 

 the preceding: s^onus. Their shells are often very remarkable for the beauty of the colours and patterns whicb are 

 jtaiiited on tliL-ir surface. [There is reason to believe that the i,^enera Cjmba, RIeio, and Voluta, are viviparous.] 

 JJ<ti!/iiiellii, Lam., with the form of the Voluta, has the outer lip thickened and revolute. The sinus is slii^htly 

 marked. According to Adanson, the foot is also less, and has no operculum. Tlie animal can partially cover its 

 shell by raising; the lobes of its cloak. The tentacula have the eyes upon the outer side at their base. M. de La- 

 marck distinguishes among; them the Colotnhella, by Ihc more numerous plaits 

 on the shell, and by a sweliino; of the middle of the outei- lip. It appears 

 that there is no operculum. Mitra^ Lam., has an oblong aperture with some 

 large folds on its columella, of which those next the spire are the largest. 

 Their spire is generally long and pointed. Several species are brilliantly 

 spotted with red upon a white ground. Their animal has a small foot, tenta- 

 cula of moderate length, with the eyes on the side one-third above the roots, 

 and a moderate siphon ; but it will often protrude.a proboscis longer than the 

 shell. [The genus Conohelix, of Swainson, has a form more conical than the 

 typical ILtrK j but its claim to be a good genus is denied by Sowerby.] Can- 

 cellaria, Lam. — The last whorl ventricose, and the aperture ample and round, 

 with a plate upon the columella : the spire is prominent, pointed, and the surface marked in general with cancel- 

 lated stria?. [According to Sowerby, this genus is nearly allied to Purpura.] 



The "Whelks [Bucciiunn, Linu.)* — 

 Comprise all the shells furnished -with an cinarLj;ination, or sliort canal, bent to the Ifft, and whose 

 :olumella is imt plaited. Druguieres made four genera of tlicni ; viz., Baccinuin, Purpura, Cassis, and 

 Terehra ; '^'ihieh MM. de Lamarck and Montfort have still further subdivided. 



Biicciniim, Brug., comprises the emarginated shells without any canal, the general form being oval, as well as 

 the .Tiierturc. The animals where known ha^'e no veil on the head, — a proboscis, two widely separate tentacula 

 with the eyes (.HI their outer bases, and a homy operculum. The siphon is prolonged beyond the shell. M. de 



Lamarck specially reserves the name Bucrinuni to such as have 

 the columella convex and naked, and the outer lip without 

 ribs or varix. Tbeir foot is moderate in size ; their proboscis 

 long and thick, and their penis often excessively large. [The 

 shell of the remarkable genus named Tricliotropis by Broderip 

 and Sowerby, is turbinated and keeled ; its aperture is wider 

 ami rather longer than the spire; the base entire ; but imme- 

 di iti 1\ below the obliquely truncated culumella there is an in- 

 distuict canal. The shell is ihin and delicate, covered with au 

 lidLiniis forming numerous sharp-pointed bristle-like pro* 

 < : ss( s on ihe edges of the carina; outside the shell. The horny 

 operculum is much smaller than the aperture. The animal 

 resembles a Buccinum, differing from it principally in having 

 only a very small fold of the mantle to line the nearl\ ob,s(ilctc 

 canal of the sheU. There is a British species (T. borcalis).'] 

 Nassa has the columella covered by a plate more or less thick 

 and broad, and the emargination deep, but without a canaL 

 id there are shells intermediate between the two genera. Lamarck 



lundiitum 



nbli'ji that of Buccinum, 



widely 

 The 



The aniuKi 



names I'.lninid tliose \ihieh join to a smooth shell, without plaits on the lip, a pillar that is deeply and 



undnhealed. In general furm their shell has a strong resemblance to the (Mives. [There is no operci 



animal is unknown. The Jiiril/aria, Lani., has also asmooth shell, and at the base of 



the columella a striated appendage or varix, without an umbilicus, and without a 



groove round the spire. The animal, in such species as it has been observed in, is 



similar to that of <Dtiva, and has the foot even more developed. The same naturalist 



unites those which are ribbed in the direction of the uhoils, under the generic name 



of Jiiifiiim : the lower whorl is very large and ventricose. Montfort again subdivides 



1 Joliinii Miio Ihc Dohum proper, where the base of the columella is as it were twisted; 



and iiiio I'crdi.i, where it is sharp. Their animal has a very large foot, dilated in 



front; a proboscis longer than its shell; slendei" tentiienhi ; eye,-, at their exterior 



c^ide near tbe base ; the bead without a veil, and the foot \\ilhout an opereuluni. 



Jlarjia is easily recognized by the prominent ribs which cross the whorls, and of 



w liieli the last forma a rim to the margin of the aperture. The shells arc beautiful. The animal has a very large 



9 tbe fuiiiily J-:ulomv}iuma of BUi 



