. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 336 TERRESTRIAL AIR-BREATHING MOLLUSKS. a deep groove behind it; aperture vrcW rounded, semicircular, considerably contracted by the impressed groove behind the {)eristome, and a corresponding testaceous deposit, or rib, within; umbilicus small, round, not expanded; um- bilical region not impressed; base convex. Greater diameter 8, lesser 7 mill.; height 4^ mill. Helix jejuna, Say, Journ. Phila. Acad., II. 158 (1821); Binney's ed., 9.—De Kay, N. Y. Moll., 46. — Pfeiffeu, Mon. Hel. Viv., I. 147. — Bland, Ann.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 336 TERRESTRIAL AIR-BREATHING MOLLUSKS. a deep groove behind it; aperture vrcW rounded, semicircular, considerably contracted by the impressed groove behind the {)eristome, and a corresponding testaceous deposit, or rib, within; umbilicus small, round, not expanded; um- bilical region not impressed; base convex. Greater diameter 8, lesser 7 mill.; height 4^ mill. Helix jejuna, Say, Journ. Phila. Acad., II. 158 (1821); Binney's ed., 9.—De Kay, N. Y. Moll., 46. — Pfeiffeu, Mon. Hel. Viv., I. 147. — Bland, Ann. N. Y. Lye, VI. 341 (1858).—W. G. Binney, Terr. Moll., IV. 67. ffygromia jejuna, Thyon, Am. Journ. Conch., II. 308 (1866). A species of the Florida Subregion, found originally near Jacksonville, Flor- ida,^ received by me from Indian River and St. Augustine, Florida, and noticed as far north as Savannah, Georgia. Animal dirty white, neck darker, eye-peduncles black, — not quite twice the breadth of the shell, — foot pointed. Nearly allied to M. Mohiliana ((|. v.), with which it is confounded in Vol. 11. Jaw, lingual dentition, and genitalia unknown. Mesodon Mobiliana, Lea. Shell globose, perforated, thin, smooth, with very delicate incremental striae, horn-colored ; whorls 6, convex ; suture impressed, last whorl tumid below, glo- bose, slightly descending, deeply constricted behind the peri- stome, umbilical region scarcely excavated; apex obtuse; spire elevated; aperture oblique, rounded; peristome thickened, white, reflected, its terminations distant, that of the columellar some- what concealing the perforation. Greater diameter 8|, lesser 6 M. Mobiliana. ^[\l | height, 5 mill. Helix Mobiliana, Lea, Proc. Am. Phil. Soc, II. 82 (1841) ; Trans. Am. Phil. Soc, IX. 17 ; Obs., IV. 17 (1844); in Troschel, Arch. f. Nat. 1843, II. 124. — Pfeiffeu, Mon. Hel. Viv., I. 323; IV. 122.—Binney, Terr. Moll., II. 172, PL XLII, Fig. 2, part. A species of the Southern Region, re
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