. Bulletin - United States National Museum. Science. 1 '^'iiimK Lingual dentition of L. fasciatus. rouuding, and sliortenmg of the cus))s, aud the still greater expansion, bluntly rounding, and shortening of the cutting points, which are quite changed into wide cutting edges. I have given in Terr. Moll., V, Plate X, Fig. G, a group of central and marginal teeth in a, an outer marginal in e, a marginal in profile ill d. (See also Fig. 478.) The allied species, X. vmiineus^^i&idTsfvomfasiiatiis in having a long, ^â "'"â¢^"^- blunt cutting point to its cen- tral tooth, aud by t
. Bulletin - United States National Museum. Science. 1 '^'iiimK Lingual dentition of L. fasciatus. rouuding, and sliortenmg of the cus))s, aud the still greater expansion, bluntly rounding, and shortening of the cutting points, which are quite changed into wide cutting edges. I have given in Terr. Moll., V, Plate X, Fig. G, a group of central and marginal teeth in a, an outer marginal in e, a marginal in profile ill d. (See also Fig. 478.) The allied species, X. vmiineus^^i&idTsfvomfasiiatiis in having a long, ^â "'"â¢^"^- blunt cutting point to its cen- tral tooth, aud by the presence of several true lateral teeth with long cutting points; also in the presence of several teeth show- ing a gradual change from the laterals to the marginals. A full description aud detailed figures < f its dentition are given by me in Ann. Lye. Nat. Hist. N. Y., XI, 41, Plate III. Liguus is nearly allied in its lingual dentition to Orthalicns, but in that genus also I have found one species with true lateral teeth, as will be shown below. Liig:uus fasciatus, Muller. Shell imperforate, conical, rather thick, smooth, shining, minutely striated ; whorls 7 to 8, convex, decreasing in diam- ^^°' *^^' eter gradually and regularly from the body-whorl to the apex ; suture impressed ; apex obtuse, commonly white, sometimes rosy; aperture suboval, purely white internally, sometimes with a thickened ridge within and parallel to the peristome; peristome acute, sometimes crenate; columellar margin with a thin callus, sometimes rosy; columella subtruncate in the young, entire in the mature shell, imperforate; surface beautifully variegated with broad, entire or interrupted bands, lines, and spots of brown, with bands and lines of green and yellow, and with lines of rufous, revolving upon the whorls from the apex to the aperture, but more distinct upon the outer whorls; a single system of coloring prevails in some shells, while in others there is a mingling of
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