. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. TRIODOPSIS. 307 Xolotrcma clausa, Rafinesque, Enumeration, &c, 3 (1831); ed. Binney and , 68. Isoejnomostoma inflccta, Tryon, Am. Journ. Conch., III. 54 (1867). A Post-pleioeene species, now found in the Interior Region, from Texas to the Appalachian Chain in Pennsylvania and New York; from Sea Islands of Georgia through the Northwestern States. The large specimen figured on p. 306 is from University Place, Tennessee, where the species seems most developed. Animal dark bluish slate-color; head, eye-peduncles
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. TRIODOPSIS. 307 Xolotrcma clausa, Rafinesque, Enumeration, &c, 3 (1831); ed. Binney and , 68. Isoejnomostoma inflccta, Tryon, Am. Journ. Conch., III. 54 (1867). A Post-pleioeene species, now found in the Interior Region, from Texas to the Appalachian Chain in Pennsylvania and New York; from Sea Islands of Georgia through the Northwestern States. The large specimen figured on p. 306 is from University Place, Tennessee, where the species seems most developed. Animal dark bluish slate-color; head, eye-peduncles, and tentacles almost black ; eye-peduncles long and slender; foot narrow, in length more than twice the diameter of the shell, terminating in an acute angle (see Bost. Journ. N. H., I. PI. IX.). Jaw thick, short, broad, arched, of almost uniform width quite to the blunt ends; with 14 stout, crowded ribs, visible on both anterior and posterior sur- face and denticulating either margin. T. infiecta (PI. VII. Fig. S) has 22—1—22 teeth on its lingual membrane; 7 perfect laterals. This and the following species have inner marginal teeth, with simple, not bifid, cutting points (c). It was bifid in the twenty-first tooth of one specimen examined, simple in the twenty-second, and bifid in the twenty- third, and all beyond. There were over 23—1—23 teeth on this membrane. Genitalia as in T. Rugeli. Triodopsis Rugeli, Shuttleworth. Shell imperforate, orbicularly convex, with granulate striations and few hairs, waxen horn-color; spire short, obtuse; whorls 5|, rather convex, the last sud- denly falling in front, and strongly contracted at the aper- ture; aperture depressed, narrowed by a tongue-shaped, flexuose, strong, parietal denticle ; peristome reflected, within thickened, its right termination with a large, obtuse, very deeply seated tooth (whose position is marked on the exterior of the shell by a groove or pit), the basal terminus furnished with a smaller, transverse, sub
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