. 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 ... Fig. 24S. SHELLS WITHOUT CANALS 220 Amaiiropsis purpurea,Dall, the Purple Moon-sliell, Figure 249, lias apurplish shell, though thepatches of enamel near theaperture are wliite, whilethe periostracum is olive,with darker streaks. Itreaches a length of twoinches, and it is found innorthera waters, as far asPoint 249, X I (*) Sigaretus debilis, Gld., the Frail Sigaretus
. 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 ... Fig. 24S. SHELLS WITHOUT CANALS 220 Amaiiropsis purpurea,Dall, the Purple Moon-sliell, Figure 249, lias apurplish shell, though thepatches of enamel near theaperture are wliite, whilethe periostracum is olive,with darker streaks. Itreaches a length of twoinches, and it is found innorthera waters, as far asPoint 249, X I (*) Sigaretus debilis, Gld., the Frail Sigaretus, has a delicate, pure wliiteshell, very flat, with a small spire and a very largeaperture. The surface is heautifully sculptured byfine rays crossing the lines of growth. Its breadthis an inch or more, and its home is in the south. Eunaticina oldroijdii, Dall, Oldroyds Natica,resembles Figure 247 in shape, but is much thin-ner and more delicate, and is marked with almostmicroscopic sculpturing. It has been dredged atseveral places along the California shore, but isstill a rare species. My specimen from Montereymeasures 35mm. in height. Velutina lavigata, Linn., the LightVelvet-shell is our next species, and its ^^^litt
Size: 1346px × 1857px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
