. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ARIONTA. 353 aperture, <^ranulate(l, finely striate find lursutc; spire siibpyramidal; whorls 6, slijjlitly convex, the last carinated at its middle, inflated below, slightly descending; aperture ohlicpie, lunate, sub- Fig. 230. angulate, white and banded within; peristome white, thiekencd, reflected, partially concealing the open um- bilicus, ends approached. Greater diameter 25, lesser 19 mill.; height, 10 mill. Helix Hillchraixdi, Newcomb, Proc. Cal. Acad. Nat. Sci., III. 115, 181 (1864).— W. G. BiNNEY,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ARIONTA. 353 aperture, <^ranulate(l, finely striate find lursutc; spire siibpyramidal; whorls 6, slijjlitly convex, the last carinated at its middle, inflated below, slightly descending; aperture ohlicpie, lunate, sub- Fig. 230. angulate, white and banded within; peristome white, thiekencd, reflected, partially concealing the open um- bilicus, ends approached. Greater diameter 25, lesser 19 mill.; height, 10 mill. Helix Hillchraixdi, Newcomb, Proc. Cal. Acad. Nat. Sci., III. 115, 181 (1864).— W. G. BiNNEY, L. & Sh., 1. 1G3, Fig. 281 (1869). Aglaja HUlchrandiy TiiYON, Am. Joum. Conch., II. 310, PI. V. Fig. 7 (1866). Tulumne County, California Region; also near Mariposa. a. Hiiubrandi. The specimen figured is from Dr. Newcomb. Animal Fig. 237. ARIONTA, Leach. Animal heliciform, mantle subcentral; other characters as in Patula. Pro- vided with a thick, white epiphragm. Shell umbilicately perforate, conic- or depressed-globose, thin; whorls 5-6, the last gradually descending; aperture lunate-rotund; peristome broadly labi- ate, its margins parallel, the basal dilated, often covering the umbilicus. The genus is almost exclusively confined to the California Region of our limits. There is, however, one Mexican species, one African, and one Euro- pean, A. arhustorum. The jaw of the last agrees with that of our species. Jaw thick, high, arched, ends but little attenuated, blunt; cutting margin without median projection; anterior surface with a few, separated, stout ribs, deeply denticulating either margin, and so disposed as to leave each end of the jaw free from ribs. I have counted 6 ribs on the jaw of arrosa; 9 in Toicnsendi- ana; 6 in tudiculata; 4 in Dupetuhouarsi; 6 in Nickli- niana; 6 in redimita; 6 in exarata; 5 in Diabloensis; about 7 in Carpeuteri; 3 in ramentosa; 5 in Ayresiana; 5 in Californiensui; 4-6 in sequoicola; 8 in Traski; 8 \r\ facta; 6 in Ke
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