Elements of Zoology for Schools And Science Classes
Elements of Zoology for Schools And Science Classes
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In our eReader you can find the full English version of the book. Read Elements of Zoology for Schools And Science Classes Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Elements of Zoology for Schools And Science Classes
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The valves are shut by the adductor (Lat. Ad. To ; duco, I lead) muscles. There are sometimes two of these 108 ZOOLOGY.
muscles, and sometimes only one. One is placed in the anterior part of the shell, and one in the posterior. The anterior muscle is sometimes absent. These muscles leave impressions in the interior of the valves, so that it can be easily ascertained, by examining a shell, whether the living animal had one or two. The valves in ordi- nary circumstances are kept open; but, when t...he animal is alarmed, it exerts its adductor muscles, and closes them. A dead bivalve always gapes, because, when the adductor muscles cease to act, the elasticity of the liga- ment opens the valves.
FIG. 45. VENUS, showing Foot and Breathing Siphons.
Most lamellibranchs possess a foot, which is pro- truded through an opening in the mantle, on the lower surface of the body. The foot is a muscular organ, sometimes finger-shaped, and sometimes bent like a sickle. This foot enables the animals, in some instances, to move along by making a number of short leaps.
What to read after Elements of Zoology for Schools And Science Classes?
You can find similar books in the "Read Also" column, or choose other free books by M Harbison to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The valves are shut by the adductor (Lat. Ad. To ; duco, I lead) muscles. There are sometimes two of these 108 ZOOLOGY.
muscles, and sometimes only one. One is placed in the anterior part of the shell, and one in the posterior. The anterior muscle is sometimes absent. These muscles leave impressions in the interior of the valves, so that it can be easily ascertained, by examining a shell, whether the living animal had one or two. The valves in ordi- nary circumstances are kept open; but, when t...he animal is alarmed, it exerts its adductor muscles, and closes them. A dead bivalve always gapes, because, when the adductor muscles cease to act, the elasticity of the liga- ment opens the valves.
FIG. 45. VENUS, showing Foot and Breathing Siphons.
Most lamellibranchs possess a foot, which is pro- truded through an opening in the mantle, on the lower surface of the body. The foot is a muscular organ, sometimes finger-shaped, and sometimes bent like a sickle. This foot enables the animals, in some instances, to move along by making a number of short leaps.
What to read after Elements of Zoology for Schools And Science Classes?
You can find similar books in the "Read Also" column, or choose other free books by M Harbison to read onlineMoreLess
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