A Text-Book in General Zoölogy
A Text-Book in General Zoölogy
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In our eReader you can find the full English version of the book. Read A Text-Book in General Zoölogy 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 Text-Book in General Zoölogy
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To quickly assess the difficulty of the text, read a short excerpt:
— Diagram of a lancelet.
The blood is white and is made to circulate by the contrac- tions and expansions of one of the arteries. No true heart is present. It has no backbone; but the notochord persists throughout life. Remember that in the sea squirts the notochord was present only in the larval stages. Here we find it existing throughout life.
The alimentary canal is very simple and nearly straight.
The spinal cord lies just above the notochord, is slender and tapering. No true brain is prese...nt.
Lampreys Class. — Marsipobranchii {saclike gills) Lampreys. — They are long, smooth, and cylindrical, ap- pearing much like eels. In fact, they are often called "lam- prey eels." There are at least twelve species in the United States. They vary in length from one to two feet. The mouth is circular and is formed for suctioii. The interior Digitized by Google 206 UROCHORDA AND VERTEBRATA surface of the mouth of the common sea lamprey is covered with strong teeth and even the tongue is furnished with three large teeth.
What to read after A Text-Book in General Zoölogy?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
— Diagram of a lancelet.
The blood is white and is made to circulate by the contrac- tions and expansions of one of the arteries. No true heart is present. It has no backbone; but the notochord persists throughout life. Remember that in the sea squirts the notochord was present only in the larval stages. Here we find it existing throughout life.
The alimentary canal is very simple and nearly straight.
The spinal cord lies just above the notochord, is slender and tapering. No true brain is prese...nt.
Lampreys Class. — Marsipobranchii {saclike gills) Lampreys. — They are long, smooth, and cylindrical, ap- pearing much like eels. In fact, they are often called "lam- prey eels." There are at least twelve species in the United States. They vary in length from one to two feet. The mouth is circular and is formed for suctioii. The interior Digitized by Google 206 UROCHORDA AND VERTEBRATA surface of the mouth of the common sea lamprey is covered with strong teeth and even the tongue is furnished with three large teeth.
What to read after A Text-Book in General Zoölogy?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
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