. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... !■ ig ^7^- X I (*) Figure 273 representsanother rare shell dredgedoff the coast of southernCalifornia. Its name isCalliostoma t u r h i n u m,Dall, the Turbaned Top-shell. This shell is small,being only 12mm. body of the shell iswaxen, showing nacre, andis ornamented with some small flamules of darkbrown, not shown in the engraving. Calliostoma s pi e n-dens, Cpr., the S
. West American shells; a description in familiar terms of the principal marine, fresh water and land mollusks of the United States found west of the Rocky Mountains, including those of British Columbia and Alaska ... !■ ig ^7^- X I (*) Figure 273 representsanother rare shell dredgedoff the coast of southernCalifornia. Its name isCalliostoma t u r h i n u m,Dall, the Turbaned Top-shell. This shell is small,being only 12mm. body of the shell iswaxen, showing nacre, andis ornamented with some small flamules of darkbrown, not shown in the engraving. Calliostoma s pi e n-dens, Cpr., the ShiningTop-shell. This specieshas a small shell, aboutthe size of a small is of an orange-chest-nut color, with fleshy orbluish nacre. It is arare shell, found atMonterey and south-Fig. 274, XI (*) ward, and has some- times been considered to be only a variety of It is shown, greatly magnified, in Fig-ure 274. ThalStia cdffea, Gabb, the Coffee-brown Top-shell, (Turcia caffea). This is a rare shell, resem-bling a Calliostoma, but it has two folds on thecolumella, which form a distinguishing mark. Thewhorls are flattened, the sutures deep and bearded,. TOPS AND TURBANS. 24r. the epidermis coffee-brown, and the nacre green-ish. Its greatest height is 19mm. Its home is onthe California coast. Margarita pupilla, Gkl., the Little Mar-garita, Figure 275, is a northerner, living ^^in Puget Sound, but sometimes coming Fig. 275 further south. It is yellowish brown orashen in color and its four whorls are marked withspiral ridges. The umbilicus is distinct, but small,and the aperture is nearly circular. Its height issometimes as great as 13 millimeters. Margarita helicina, Fabr., the Helix Margarita,is decidedly arctic in its tastes, living on the shoresof northern Europe, eastern America, and aroundBering Strait. The shell is umbilicate, thin, fleshcolored, polished and shining. Its height is 6mm.,and its diameter is a little more. Margarita liruldta, Cpr., the Lirula
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
