Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fitr. TllE SKELETON OF ECHDSTODEEMS. 101 showing the skeleton of one of these lithophytes. The natu-ral size of the polypary is seen at fig. 69, and a magnified vie-*of one of the cells, with its rays, is given in fig. 70.] In the echinoderms, the test is brittle, and intimately united §/ with the soft parts. It is composed of numerous little plates,sometimes consolidated and immoveable, as in the sea-urchins,or combined, so as to al
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fitr. TllE SKELETON OF ECHDSTODEEMS. 101 showing the skeleton of one of these lithophytes. The natu-ral size of the polypary is seen at fig. 69, and a magnified vie-*of one of the cells, with its rays, is given in fig. 70.] In the echinoderms, the test is brittle, and intimately united §/ with the soft parts. It is composed of numerous little plates,sometimes consolidated and immoveable, as in the sea-urchins,or combined, so as to allow of various motions, as in the star-fishes (fig. 36), and in the sea-lilies (figs. 72 and 73), whichuse their arms both for crawling and swimming.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
