The Principles of Biology By J I Hamaker
The Principles of Biology By J I Hamaker
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The arms are almost soHd, that is, the digestive and reproductive organs do not extend into them. The skeletal parts are better developed than in the starfish. In the ''basket fish" the arms are branched. i. <-— i '. M ii ^ \M S^^^^^Hr^BsfjR^'^^H J i . \ IK^Sf^ m'^W' fW-'^ ^4^ 1 lit ■ T^>'»RvSK<^, |^ Fig. 146. — A brittle star (Ophiuroidea). X 3/4. 555. Class IV. Echinoidea. — In the sea urchins the radii and inter-radii are almost or quite equal and hence there are no "arms. " The skeletal parts are broad plates which fit together so as to form a single piece, the shell or test. The oral surface ECHINODERMATA 257 is down and the oral aboral axis is often nearly equal to a horizontal diameter so that the body is nearly spherical. The spines are often long and are movable and are important in locomotion. The tube feet are much as in the starfish. The true sea urchins are vegetable feeders and the mouth is pro- vided with a set of five jaws which form a complicated ap- paratus known as Aristotle's lantern.
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To quickly assess the difficulty of the text, read a short excerpt:
The arms are almost soHd, that is, the digestive and reproductive organs do not extend into them. The skeletal parts are better developed than in the starfish. In the ''basket fish" the arms are branched. i. <-— i '. M ii ^ \M S^^^^^Hr^BsfjR^'^^H J i . \ IK^Sf^ m'^W' fW-'^ ^4^ 1 lit ■ T^>'»RvSK<^, |^ Fig. 146. — A brittle star (Ophiuroidea). X 3/4. 555. Class IV. Echinoidea. — In the sea urchins the radii and inter-radii are almost or quite equal and hence there are no "arms. " The skeletal parts are broad plates which fit together so as to form a single piece, the shell or test. The oral surface ECHINODERMATA 257 is down and the oral aboral axis is often nearly equal to a horizontal diameter so that the body is nearly spherical. The spines are often long and are movable and are important in locomotion. The tube feet are much as in the starfish. The true sea urchins are vegetable feeders and the mouth is pro- vided with a set of five jaws which form a complicated ap- paratus known as Aristotle's lantern.
What to read after The Principles of Biology By J I Hamaker?
You can find similar books in the "Read Also" column, or choose other free books by John Irvin Hamaker to read online
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