. 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 ... ne of our most com-mon species, Fissurella volcano,Rve., the Volcano-shell. DeadFig. 291 shells are abundant and attrac- tive, and living specimens, with yellow foot andred-striped mantle, may often be found on therocks at low tide. The shell is about an inch inlength and is oblong-conical in form, while thered stripes on its sides, running down from thesmall, oblong hole at the
. 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 ... ne of our most com-mon species, Fissurella volcano,Rve., the Volcano-shell. DeadFig. 291 shells are abundant and attrac- tive, and living specimens, with yellow foot andred-striped mantle, may often be found on therocks at low tide. The shell is about an inch inlength and is oblong-conical in form, while thered stripes on its sides, running down from thesmall, oblong hole at the top, suggest streams ofred-hot lava issuing from the crater of a coloring appears plainest on dead shells; thelive ones are darker, smoother, and less brilliant. Fissuridea asp era,Esch., the RoughKeyhole-limpet, Fig-ure 292, (Glyphis as-pera). This shell isquite conical, with asmall, oval hole at tlietop, very different Fig. 292 from the narrow, oblong slit of the last edge is wrinkled, the co^or gray on the out-side, with dark, purplish rays running down fromthe apex, while the interior is white. The commonsize is rather less than that of the cut, thoughsome specimens are much 260 WEST AMERICAN SHELLS Fissuridea murina, (Cpr.) Dall, the White Key-hole-limpet, (Glyphis densiclathrata). This specieshas a much smaller and more delicate shell thanthe last. It is oblong in shape, with curved roundish oval hole is one-third of the shellslength from one extremity, and there are numerousfine ribs, checked by concentric ridges. The coloris pure white, at least in dead specimens, and thelength is about 15mm., a little less than the diame-ter of a silver dime. Lucapina cren-iildta, Sby., theGreat Keyhole-limpet, Figure293. This is byfar the largestand finest of theAmerican Fissu-rellida. A smallfigure of the shellis shown in Figure 293. Though this shell is oftensome four inches long, the animal is much larger,and somewhat resembles a brick both
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
