A Laboratory Course in Invertebrate Zoöloy
A Laboratory Course in Invertebrate Zoöloy
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In our eReader you can find the full English version of the book. Read A Laboratory Course in Invertebrate Zoöloy 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 A Laboratory Course in Invertebrate Zoöloy
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Draw.
(d) The Digestive System. — Select a specimen that has been killed while the proboscis remained protruded and note the terminal mouth-opening, and the lingual ribbon or odontophore, projecting slightly from its lower side. With a pair of scissors slit open the proboscis along its mid-dorsal line, taking care to cut only through the skin. Immediately below the incision, the light-colored oesophagus will be seen as a straight tube. It extends from its opening into the pharyngeal cavity \ im...mediately over the end of the odonto- phore, to the upper end of the proboscis, where it abruptly dips into the substance of the body. Note the small fibres that attach it to the integument, and which, at its outer end, are deeply colored, and may, by their contractility, give the organ a pumping function. Extending from the base of the proboscis into the substance of the body are a pair of white muscle bundles, the right and left retractors of the proboscis.
Below the oesophagus lies the deep-colored muscular mass that brings about the movement of the lingual ribbon.
What to read after A Laboratory Course in Invertebrate Zoöloy?
You can find similar books in the "Read Also" column, or choose other free books by Bumpus, Hermon Carey, 1862- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Draw.
(d) The Digestive System. — Select a specimen that has been killed while the proboscis remained protruded and note the terminal mouth-opening, and the lingual ribbon or odontophore, projecting slightly from its lower side. With a pair of scissors slit open the proboscis along its mid-dorsal line, taking care to cut only through the skin. Immediately below the incision, the light-colored oesophagus will be seen as a straight tube. It extends from its opening into the pharyngeal cavity \ im...mediately over the end of the odonto- phore, to the upper end of the proboscis, where it abruptly dips into the substance of the body. Note the small fibres that attach it to the integument, and which, at its outer end, are deeply colored, and may, by their contractility, give the organ a pumping function. Extending from the base of the proboscis into the substance of the body are a pair of white muscle bundles, the right and left retractors of the proboscis.
Below the oesophagus lies the deep-colored muscular mass that brings about the movement of the lingual ribbon.
What to read after A Laboratory Course in Invertebrate Zoöloy?
You can find similar books in the "Read Also" column, or choose other free books by Bumpus, Hermon Carey, 1862- to read onlineMoreLess
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