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Show 376 :MOLLUSCA. • d h argin undulated; the inferior whorl is ample whorls, ren er t e m . . e Montfort subdivides them mto a nd ventricos · f h 1 1 lled where the lower part o t e co umella DouuM, proper y so ca ' is twisted( l ), and into PERDIX, where it is trenchant(2). . . · 1 h ry large foot, widened before; a proboscis Their amma as a ve . · h 11 d slender tentacula, on the external s1de of lon.g er than 1ts s he 'b ans e are the eyes; the head has no ve'1l, nor has which, and near t e a ' the foo~ an operculum. HARPA, Lam. H S'Ily recognized by the projecting, transverse The arpre are ea . . . 1 1 • th last of which forms a hp on the margm. ribs on the w 10r s, e . 11 The she 1· s b eau t1'f u 1 , and the animal has a very. larg. e fo. ot., po,m ted . d d 'd ed l·n its anterior portion, wluch lS dlstmguished behm , an WI en . f · t' ns The eyes are on the s1des o the tenta· by two deep emargma 10 • , h . b e It has neither veil nor operculum, 3). The cula, and near t e1r as • PuRPURA, Brug. Is known by its flattened columella, which is trenchant near t.he end opposite to the spire, and which, with the e~ternal margm, forms a canal there, sunk in the shell, but not salient.. The P~r· purre wet·e scattered among the Buccina and th~ Mur1ces of Lm· nreus. The animal resembles that of a true Buccmum( ~)· The genus LwoRNE, Montf .,-M oNoOERos, Lam ., cons1sts of shells similar to the Purpurre, but m. wh1· c 11 t h e externa1 edge of the emar· gination is furnished with a salient spine( 5.)· . h h the columella or Others, also resembling the Purpur::e, m w 1c . . d S b G of Shells No. 29;-B. (1) Buc. olearwm, LJst., 985, 44, an ower ., en. . ' f t Ill galea, List. 898, 18;-B. dolium, List.,. 8:9, 19;-B. f~r:tatum, Brug., ~ ar ., ' cxviii, 1081;-B· pomt~m, Id., II, xxxv1, <>70, 371. (2) Bucc. perdix, List., 984, 43. . vith it-List., t3) Buccinum harpa, L., and the other spectes long confouncled 'd Q and ' . Ib M . Reynau uoy, 992 993 994· Mart., III, cx1x; Bucc. costatum, · essrs '. rtof Gay' mard' have' observed, that, under certain circumstances, t1 1e Po stenor pa the foot is spontaneously detached. 4g.-B. ht (4) Buccinumpersicum, List., 987, 46,47;-B. patulum, Id., 989,.Mi' m~toma, Id., 988, 48;-B. trochlea, B. lapillus, Id., 965, 18, 19 ~-llau~t. Id. 990, 50;-Mm·.ltistrix, Martini, III, ci, 974, 975;-.llfur. manctne ' ' 7 8 957 9-10·-.Miu·. hi'npncastanum, List., 955,996, 990,991. l ' (5' ) Bu' ccinum' monodon, :rG. m., Martini, III, lxix, 761;-B ucc. nar va ' uniwrne, Id. GASTE:ltOPODA PECTINIBRANCHIAT A. 377 at least the margin is provided, in the adult, with teeth which narrow the aperture, form the Sxs'tRA, Mont£., or the RwtNULA, Lam.( 1) CoNOHOLEPAs, Lam. the general characters of the Purpur::e, but the aperture is so enormous, and the spire so small, that the shell has almost the appearance of a Capulus, or one of the valves of an Area; a small salient tooth is visible on each side of the emargination. The ani· mal resembles that of a true Buccinum, with the exception of its foot, which is enormous in width and thickness, and that it is attached to the shell by a muscle shaped like a horse-shoe, as in the Capuli; it has a thin, narrow, and horny operculum. But a single species is known, theBuccinum conclwlepas,Brug.; Argenv., pl. ii, f. F, D; and Sowerb., Gen. of Shells, No. VI. From the coast of Peru • CAssis, Brug. The shell oval; aperture oblong or narrow; the columella covered with a plate as in N ass a, and that plate transversely plica ted, as well as the external margin; the emargination terminating in a short canal, that is reflected and pushed back, as it were, to the left: varices are frequently observed on it. The animal resembles that of a true Buccinurn, but its horny operculum is denticulated, in order to pass between the plic::e of the external margin. In some, the lip of the margin is denticulated externally near the emargination( 2 ). In others it is entire(3). The MoRlo, Montf.-CAssiDARIA, Lam. Was separated from Cassis by Montfort. The canal curves less suddenly, and the whole shell leads directly to certain Murices. The animal resembles that of a Buccinum, but its foot is more developed( 4). (1) Murex ricinus, L., Seb., Ill, lx, 37, 39, 42;-Mur. neritoi'deus, Gm., No. 43, List., 804, 12-13. B (2). Buccinum vibex, Martini, U, xxxv, 364, 365;-B. glaucum, List., 996, 60;-. cr&fUleeus, List., 1015, 73. (3) The Buctinum of the second division of Gmelin, except the B. echinoplwrum, strigosum, No. 26, and tyrrhenum, which are Cassidaria:. It must also be re· c.ollected, that, among the true Cassides, Gmelin appears to have several repetibons. B (4) .Buccinum caudatum, L., List., 940, 36;-B. echiniphmum, List., 1003, 68;. alrtgo&um, Gm., No. 26, List., 1011, 71, f, ;-Bucc. tyrr!tenum, Bonam., UI, 160. Vot. II.-2 X |