Bulletin of the Museum of Comparative Zoology at Harvard College . ed longitu-tudinally, the median and following whorls be-coming somewhat obscurely sculptured other than t^v^MHiR ffiLVWby distinct growth lines. The basal whorl is jgry^strongly sculptured below, and back of the mouth,and obtusely angulated underneath. Apertureovate, slightly angulated anteriorly, somewhat effuse, rimmed and projecting. The dimensions of two ex.^mples are asfollows: — mm. Longitude 12J Longitude 13 Greatest diameter 4 Greatest diameter 4 Dos Cabezas, Arizona, where the above two specimens and numerous fragment
Bulletin of the Museum of Comparative Zoology at Harvard College . ed longitu-tudinally, the median and following whorls be-coming somewhat obscurely sculptured other than t^v^MHiR ffiLVWby distinct growth lines. The basal whorl is jgry^strongly sculptured below, and back of the mouth,and obtusely angulated underneath. Apertureovate, slightly angulated anteriorly, somewhat effuse, rimmed and projecting. The dimensions of two ex.^mples are asfollows: — mm. Longitude 12J Longitude 13 Greatest diameter 4 Greatest diameter 4 Dos Cabezas, Arizona, where the above two specimens and numerous fragmentswere found in a cave in November, 1889, by V. Bailey, and contributed to theUnited States National Museum (No. 104,392) by Dr. C. Hart Merriam. Among the species of this group that are geographically related is 77. Remondi,Gabb, described from Arivechi, Province of Sonora, Mexico, a form sharply sculp-tured throughout, and in minor features also different; H. Pfeifferi, Menke, col-lected by Remond at Hermosillo, in the same province, with the previously named. 202 BULLETIN OF THE species; and H. (Ccdocentrum) irregulare of Gabb, from the high table-lands back ofMulege, in the peninsula of Lower California. All of these are separable at aglance from Arizonensis. The above is Stearnss description, and figure from Proc. U. S. National Mus.,Vol. XIII. p. 208, Plate XV. Figs. 2, 3, 1890. Onchidella borealis, Dall. Coos Bay, Oregon. It is gregarious in its habits. Fifty specimens were taken in a small crevice ofclay shale, near high tide. Single individuals, or several clustering together, weretaken afterwards lower down on the tide under loose stones. When in motion, theanimal moves off quite rapidly for so small a creature, with two short, stout pedun-cles protruding in front of the mantle, bearing keen, sharp black eyes. The color isdark slate, splashed with blotches and streaks of ashen white. The body when inmotion is -J inch long, ^ wide, J high, and oblong-oval in form, a l
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Keywords: ., bookcentury1800, bookdecade1860, bookidbullet, booksubjectzoology
