432 



A MANUAL OF AMERICAN LAND SHELLS. 



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, 

 ^■"'"•^"^- 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 z./asdatus. 

 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 all of 

 them ui)on the same specimen. Extreme length, 58"""; diameter, 23""". 



