. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 292 TERRESTRIAL AIR-BREATHING MOLLUSKS. Fie;. 189 shows the internal tubercle. Animal light-colored, head and eye-peduncles darker ; foot narrow, trans- lucent, length little more than the diameter of the shell, j)ointed at the end. Eyes black, eye-peduncles 6 mill. long. Shell carried horizontally on the back. Jaw, as usual, with 8 ribs. Lingual membrane (Plate VII. Fig. B) with 27—1—27 teeth; 9 perfect laterals; the eleventh tooth has a bifid inner cutting point. Plate XIV. Fig. II represents the genital sy
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 292 TERRESTRIAL AIR-BREATHING MOLLUSKS. Fie;. 189 shows the internal tubercle. Animal light-colored, head and eye-peduncles darker ; foot narrow, trans- lucent, length little more than the diameter of the shell, j)ointed at the end. Eyes black, eye-peduncles 6 mill. long. Shell carried horizontally on the back. Jaw, as usual, with 8 ribs. Lingual membrane (Plate VII. Fig. B) with 27—1—27 teeth; 9 perfect laterals; the eleventh tooth has a bifid inner cutting point. Plate XIV. Fig. II represents the genital system of this species. The penis sac is very long, attenuated at either end, greatly swollen at the median third of its length. The genital bladder is oval, on a short duct. Fig. S. labrosit}fi, enlarged. Stenotrema labrosum, Bland. Shell imperforate, lenticular, carinated, the carina somewhat obsolete behind the aperture, solid, with curved striaj, dark-brown colored beneath the epider- mis ; epidermis thin, with prostrate hairs ; spire convex- conoid, obtuse ; whorls 5^, rather convex, the last deflexed, constricted, the base inflated, and sculptured beneath the epidermis with numerous impressed spiral lines; the aper- ture very oblique, narrowly ear-shaped, contracted by a strong linguiform tooth extending along the entire parietal wall; peristome callous, somewhat reflected, the margin joined by a sinuous callus, the basal margin thickened, in- wardly much dilated, with a deep and wide notch in the middle ; with an internal transverse tubercle on the base of the shell. Greater diameter 12|, lesser 10 mill.; height, 6| mill. Helix labrosa, Bland, Ann. N. Y. Lye, VII. 430, PI. IV. Fig. 19 (1861).—W. G. BiNNEY, L. & Sh., I. 113 (1869). Stenotrema lahrosa, Tryon, Am. Journ, Conch., III. 59 (1867). A species of the Cumberland Subregion, ranging southerly into Alabama, southwesterly into Arkansas. The thickened and reflected peristome, and deep wide notch, s
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