Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . which is not the case in ordinary metamor-phoses. Moreover, the upper segment does not follow theothers in their development. Its office seems to be accom-plished as soon as the other segments begin to be indepen-dent ; being intended merely to favour their development, bysecuring and preparing the substances necessary to theirgrowth. In this respect it resembles the nurse of the Cer- cana. Fig. 367. § 530. The Hydraform-Polyps present ph
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Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . which is not the case in ordinary metamor-phoses. Moreover, the upper segment does not follow theothers in their development. Its office seems to be accom-plished as soon as the other segments begin to be indepen-dent ; being intended merely to favour their development, bysecuring and preparing the substances necessary to theirgrowth. In this respect it resembles the nurse of the Cer- cana. Fig. 367. § 530. The Hydraform-Polyps present phenomena no less numerous and strange. The Campanulariahas a branching, plant-like form, with littlecup-shaped cells on the ends and in the axilsof the branches, each of which contains alittle animal. These cups have not all thesame organization. Those at the extre-mity of the branches (a], and which appearfirst, are furnished with long tentacles, wherewith they seize their food (fig. 367).Those in the axils of the branches, andwhich appear late, are females (b), andhave no such tentacles. Inside of the lat-ter, little spherical bodies are found, each. * These free segments have been described as peculiar animals, underthe name of Ephyra.