. Bulletin - United States National Museum. Science. Helix vortex, Pfeiffer, Arch. f. Nat., 1839, ii, 351; Mon. Hel. Viv., i, M. vortex. 95.—Chemxitz, ed. 2, ii, 110, pi. Ixxxviii, figs. 7-9.—Reeve, Cou. Icon., 644 (1852).—Gould, Terr. Moll., iii, 34.—W. G. BIxVNEY. Terr. Moll., iv, 117; L. & Fr. W. Sli., i. Helix seUnina, Gould, Bost: Proc, ii, 38 (1848); iu Terr. Moll., 11,240, i)l. xxix, a, fig. 2; pi. xlviii, fig. 2.—Reeve, Con. Icon., 716(1862). Hi/alimi vortex, Tryon, Am. Journ. Couch., ii, 252 (1866). Microphysa vortex, W. G. Binney, Terr. Moll.,v, 171. Florida Sul)region; Southern
. Bulletin - United States National Museum. Science. Helix vortex, Pfeiffer, Arch. f. Nat., 1839, ii, 351; Mon. Hel. Viv., i, M. vortex. 95.—Chemxitz, ed. 2, ii, 110, pi. Ixxxviii, figs. 7-9.—Reeve, Cou. Icon., 644 (1852).—Gould, Terr. Moll., iii, 34.—W. G. BIxVNEY. Terr. Moll., iv, 117; L. & Fr. W. Sli., i. Helix seUnina, Gould, Bost: Proc, ii, 38 (1848); iu Terr. Moll., 11,240, i)l. xxix, a, fig. 2; pi. xlviii, fig. 2.—Reeve, Con. Icon., 716(1862). Hi/alimi vortex, Tryon, Am. Journ. Couch., ii, 252 (1866). Microphysa vortex, W. G. Binney, Terr. Moll.,v, 171. Florida Sul)region; Southern Florida and the adjacent islands, Fig. ?s5. introduced from the West Indian fauna; also west coast of Florida. The species is apparently viviparous. Fig. 385 represents Embryonic youii's of an embryonic shell taken from an adult by Mr. Morse. M. vortex, enlarged. rpj^jg gjQall spccics docs not excccd Zonites arhorens in size. Its transparency is greater than that of any other of our species. The general character of its upper surface is that of depression ; but though the whorls revolve in nearly the same plane, the suture is so deeply impressed that each whorl is rendered convex or tumid. The umbilicus is of small diameter, but well defined and deep. The aperture is trans- verse and flattened in its vertical diameter; the peristome is thin, sharp, and not turned outwards. The convexity of the base being greater than that of the upper surface, an obtuse angle is sometimes produced on the periphery of the shell at the line of their junction, which is more or less prominent in different specimens. Jaw of a specimen collected by Mr. H. Hemphill at Marco, on the Fig. 385 a. west coast of Florida, low, fig. 385 6. c^^ C^TlQrO slightly arcuate, with little ^^^ / ^1 \)\ attenuated, blunt ends; trans- parent, very thin, so as to Lingual dentition of lficro^%sa • i i vortex. curl ovcr on Us ends and mar- gins ; no median projection to lower margin ; about 30 widely separated
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