The University Geological Survey Of Kansas (volume 6, Pt. 2)

Paperback | January 9, 2012

byKansas Geological Survey

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1903. Not illustrated. Excerpt: ... to recognize but the one species, and think there is but little doubt that his Spirigera caputserpentis is the same as the form above described. The shells vary enough to easily include Swallow's description. The microscopic indications of striae mentioned in the various descriptions of this shell are probably due to the fibrous structure of the shell, which is quite coarse. PELECYPODA. Pelecypods (sometimes called lamellibranchs) are a group of animals known under the names of mussels, clams, and oysters. They live in fresh and salt water, and are covered by a shell which is made up of two halves, or valves. Brachiopods have one valve on top and one on the bottom of the animal, but the halves of the clam shell are located one on the right side and one on the left. The body is nearly enclosed in a mantle or fleshy membrane, which nearly surrounds the soft part of the body. It is divided into two parts or halves, called lobes, which secrete the two halves of the shell. Sometimes this mantle is somewhat grown together for a large part of the way along the lower sides of the animal near the open edges of the shell. In those with the mantle edges fastened together there are two openings in the rear end; these openings are sometimes prolonged into tubes called siphons, which are used in breathing. A current of water passes constantly in through one of these and out through the other. In those which do not have the mantle united there is generally no siphon. The edge of the mantle is also attached to the shell, impressing a line nearly parallel with the edge of the shell. When the siphons are present there is an inward notch or angle in the line in the back part of the shell, caused by the muscles used in pulling the siphon into the shell. When the siphons are absent ...

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1903. Not illustrated. Excerpt: ... to recognize but the one species, and think there is but little doubt that his Spirigera caputserpentis is the same as the form above...

Format:PaperbackDimensions:122 pages, 9.69 × 7.44 × 0.26 inPublished:January 9, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217617549

ISBN - 13:9780217617543

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