. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. B. alternatus (Say). in Mexico, as many specimens were sent me by Mr. Maclurc; but from what particular locality I know not. (Say.) Bulimus alternatHit, SAY, New Harmony Diss., Dec. 30, 1830; Descr., 26; cd. Binney, 39. — PFFaiFiat, Mon. IIcl. Viv., II. 221.—W. G. BiKNKY, Terr. Moll., IV. 126, n. LXXX. Figs. 1, 3, 18 ; L. & Sh., I. 200 (1869). BuliiMis dealbatus, Binney, part, Terr. Moll., II. 276, PI. LI. a, upper and lower fi^., PI. LI. b. — Not Say. BuUmxLS Marice, Aluers, Heliceen, 162. — Pfeif
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. B. alternatus (Say). in Mexico, as many specimens were sent me by Mr. Maclurc; but from what particular locality I know not. (Say.) Bulimus alternatHit, SAY, New Harmony Diss., Dec. 30, 1830; Descr., 26; cd. Binney, 39. — PFFaiFiat, Mon. IIcl. Viv., II. 221.—W. G. BiKNKY, Terr. Moll., IV. 126, n. LXXX. Figs. 1, 3, 18 ; L. & Sh., I. 200 (1869). BuliiMis dealbatus, Binney, part, Terr. Moll., II. 276, PI. LI. a, upper and lower fi^., PI. LI. b. — Not Say. BuUmxLS Marice, Aluers, Heliceen, 162. — Pfeiffer, Proc. Zocil. Soc, 1858, 23; Mon. HeL Viv., III. 350; in Chemnitz, ed. 2, 157, PI. XLVIIL Figs. 7, 8. — W. G. BiNNEY, Terr. Moll., IV. 128. Bulimus Bimieyamis, W. G. Binney, Terr. Moll., IV. 128. — Not Pfeiffer. ThaumasiiLS altcrnatiis, Tryon, Am. Journ. Conch., III. 171, PL XIII. Fig. 16 (1867). Thamnastus Maricc, Tryon, Am. Journ. Conch., III. 172, PI. XIV. (1867). Texan Subregion. From Louisiana through Texas into Mexico. It belongs rather to the fauna of Mexico, extending into the Isthmus of Tehuantepec.^ Found in great numbers upon bushes, the ground below them being often cov- ered with dead shells. This species is readily distinguished from the allied forms by its greater solidity, its highly polished surface, its more elongated form, its dark-colored aperture, bor- dered with the white internal margin of the peritreme, and the tooth-like callus upon the upper portion of the columella. It varies con- siderably in form, being sometimes quite slender, at others quite globose. In color it shows every variation from uniform brownish to pure white. The aperture, however, is always dark, and has a white, thickened rim within the peristome. It is most attractive when ornamented with alter- nate white and brown longitudinal blotches. There can, I believe, be no doubt that the shell under consideration is what Mr. Say described as alternatus. His description is gi
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