. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 124 TERRESTRIAL AIR-BREATHING MOLLUSKS. Hyalina capsella, Tryon, Amer. Journ. Conch., II. 252 (1866). —\V. G. Binney, L. & Sh., I. 76, Fig. 72 (1869). Mountains of Eastern Tennessee: a species of the Cumberland Subregion. Animal unknown. Formerly I referred as a synonyme to this species, Z. placentida, q. v., describing and figuring the animal and dentition. I am, however, now con- vinced of its diflerence. See below. Zonites placentula, Siiuttlewortii. Shell widely umbilicated, very much depresse
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 124 TERRESTRIAL AIR-BREATHING MOLLUSKS. Hyalina capsella, Tryon, Amer. Journ. Conch., II. 252 (1866). —\V. G. Binney, L. & Sh., I. 76, Fig. 72 (1869). Mountains of Eastern Tennessee: a species of the Cumberland Subregion. Animal unknown. Formerly I referred as a synonyme to this species, Z. placentida, q. v., describing and figuring the animal and dentition. I am, however, now con- vinced of its diflerence. See below. Zonites placentula, Siiuttlewortii. Shell widely umbilicated, very much depressed, arctispiral, very shining, marked by irregular, distant, impressed striae, horn-color, diai)hanous, below of uniform color : whorls 7, most gradually increasing, scarcely convex, the last convex below, subexcavated around the umbilicus; aperture oblique, lunate; peristome simple, acute. Greater diameter 7|, lesser 6^ mill; height, 3 mill. Near Z. demissus^ but most readily distinguished by its more depressed shell, its wider umbilicus, and especially by the ab- z placentula scnce of the heavy opaque white callus in the aperture on the base of the last whorl (Shuttl.). Zonites -placentula, Siiuttlewortii, Bern. Mit. 1852, 194.—Gould in Terr. Moll., III. 19. — Pfeiffer, Mon., III. 631. A species of the Cumberland Subregion, having been received from the moun- tainous region of Tennessee (Jalapa, etc.); from Whitley County, Ken- tucky, from Lexington, Virginia. I have also received it from the Hot Springs of Arkansas, proving that it has the southwestern range beyond tiiis subregion noticed in many of its species. It is also quoted, but I think incorrectly, from Colorado by Ingersoll. Animal with distinct locomotive disk, longitudinal furrows, and caudal mucus pore. Jaw as usual in the genus. The lingual membrane (PI. III. Fig. L) has 25—1—25 teeth, with 3 perfect laterals, and 1 transition tooth. This species has been confounded with Z, capsella, but differs greatly
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