. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ARIONTA. 3G9 l^T^^g^W'" /F, A. Diablotnsis. Hdlx Dlahlocnsis, J. C. Coopeii, Am. Journ, Conch., IV. 221, no descr.; Cal. I'loc, III. 2G0, descr. without imiuc. Li/simw JUubloaisiSy J. G. Cooi'KU, Proc. Acad. Nat. Sci. ^'8- 250. rhila., 1872, p. 150, VI III. Figs. 0, 1-4. Californian Region, Mt. Diablo near San Francisco. Jaw, as usual; 5 ribs. Lingual nieml)ranc (PI. IX. Fig. T) as usual in the genus. Tlu' central and first lateral teeth have no side cusps or cutting points; these appear on the thirteent
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. ARIONTA. 3G9 l^T^^g^W'" /F, A. Diablotnsis. Hdlx Dlahlocnsis, J. C. Coopeii, Am. Journ, Conch., IV. 221, no descr.; Cal. I'loc, III. 2G0, descr. without imiuc. Li/simw JUubloaisiSy J. G. Cooi'KU, Proc. Acad. Nat. Sci. ^'8- 250. rhila., 1872, p. 150, VI III. Figs. 0, 1-4. Californian Region, Mt. Diablo near San Francisco. Jaw, as usual; 5 ribs. Lingual nieml)ranc (PI. IX. Fig. T) as usual in the genus. Tlu' central and first lateral teeth have no side cusps or cutting points; these appear on the thirteenth. The eighteenth tooth has its inner cusp bifid; there may, therefore, be said to be 17 laterals. The mar- ginals are low, wide, with one inner, long, oblique, bifid cutting point, and one outer small cutting point. There arc 37—1—37 teeth. Genitalia as in A. exarata. Dr. Cooper remarks: It is remarkable for having 7 whorls, while A. sequoi- cola and A. Mormonum of the same size have but 6 ; it is also less com- I)ressed than the latter, and the umbilicus is less covered. The color where remaining is shining gamboge-yellow (faded), with a single very narrow band above the middle, not showing the pale band on either side of it, which is so marked in others of the genus. The sculpture seems to have been very slightly int\(ented, and with the faint lines of growth cut by smooth depressed waved grooves transversely, and thus obliquely to the sutures (while those of A. Traski are parallel). Greater diameter, mill.; height, inch. Mt. Diablo range. Arionta Traski, Newcomb. Sliell umbilicated, globosely depressed, very thin, translucent, dark horn- colored, with a revolving chestnut band, doubly edged with white; with delicate oblique striaj and crowded micro- scopic revolving lines ; spire hardly elevated, apex flat- tened ; whorls 6, slightly convex, gradually increasing, the last rather plane above, inflated below, not falling before, banded above the middle; umbilicu
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
