. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ARIONTA. 367 low ; umbilicus moderate, conical; aperture very oblique, ear-shaped, lunate ; peristome with a white thickening, its ends converging, the right very much arched, expanded, the columellar curved and slop- . Fiff 248 ing. reflected, expanded above. Greater diameter 29, lesser 24 J mill.; height, 12| mill. Helix Mormonum,1 Pfeiffer, Proc. Zool. Soc, 1857, 109; Mon. Hel. Viv., IV. 276. — W. G. Binney, Terr. Moll., IV. 16, PI. LXXIX. Fig. 21 ; L. & Sh., I. 171 (1869). — Fischer and Crosse, Moll. Me
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ARIONTA. 367 low ; umbilicus moderate, conical; aperture very oblique, ear-shaped, lunate ; peristome with a white thickening, its ends converging, the right very much arched, expanded, the columellar curved and slop- . Fiff 248 ing. reflected, expanded above. Greater diameter 29, lesser 24 J mill.; height, 12| mill. Helix Mormonum,1 Pfeiffer, Proc. Zool. Soc, 1857, 109; Mon. Hel. Viv., IV. 276. — W. G. Binney, Terr. Moll., IV. 16, PI. LXXIX. Fig. 21 ; L. & Sh., I. 171 (1869). — Fischer and Crosse, Moll. Mex. et Guat, 251 (1870). Aglaja Mormonum, Tkyon, Am. Journ. Conch., II. 314 (1867). In the California Region ; Mormon Island, Califor- nia ; San Joaquin Valley, north to Mount Shasta; A ^jormonum Fresno County to Klamath Lake. It is also said to have been found at the Dalles, Oregon, which would give it a much wider northern range. I doubt its existence in Sonora, from which it is also quoted. The specimens lately received from California, which appear to be referable to this species, are singularly granulated on the first one and a half apical whorls, and the epidermis of the next two or three whorls is sparingly orna- mented with small but very distinct raised lines or points, something like pros- trate hairs, being part of and same color as the epidermis. Animal uniform leaden-color, darker and with a lilac tint on head and ten- tacles. Jaw as usual; 8 ribs. (Cooper.) Lingual membrane (PI. XV. Fig. P) as usual in the genus ; teeth 50—1—50, with 15 laterals, the sixteenth tooth having its inner cutting point bifid. Epiphragm as usual in the genus. Genitalia (P!. XIII. Fig. E). The general appearance is that of , as formerly described by me, but there is an additional accessory organ (a p g) of use unknown to me. The organ (r) is a dart sac. The dart is short, stout, straight, swollen at its base, and with an enlarged acutely pointed apex (PI. XIII. Fig. F). Up
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