Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 MEDUSA (FREE SWIMMING SEXUAL STAGE) COENOSARC CASTROYASCULAR CAYITY FIG 33^. HYDROZOA-HYDROID OBEUA ;'^y^^g '^>^^â ^nMKx^^^>I^y GONADS ORAL ARM FIG. 34. SCYPHOZOA- AURELIA CASTROYASCULAR CAYITY MESENTERY FIG. 35. ACTINOZOA-PORTION OF A SEA ANEMONE Fig. 33b.âHydroid Obclia, a colonial animal of the class Hydrozoa. Compare a feeding hydranth with the structure of Hydra, Fig. 33b. (After Parker and Haswell: Textbook, of Zoology, published
Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 MEDUSA (FREE SWIMMING SEXUAL STAGE) COENOSARC CASTROYASCULAR CAYITY FIG 33^. HYDROZOA-HYDROID OBEUA ;'^y^^g '^>^^â ^nMKx^^^>I^y GONADS ORAL ARM FIG. 34. SCYPHOZOA- AURELIA CASTROYASCULAR CAYITY MESENTERY FIG. 35. ACTINOZOA-PORTION OF A SEA ANEMONE Fig. 33b.âHydroid Obclia, a colonial animal of the class Hydrozoa. Compare a feeding hydranth with the structure of Hydra, Fig. 33b. (After Parker and Haswell: Textbook, of Zoology, published by The Macmillan Co.) Fig. 34.âClass Scyphozoa illustrated by a common jellyfish, Aurelia. Fig. 35.âIllustration of the body structure of Actinozoa. The animal, Metndhim, has been cut transversely to show the mesenteries which partition the gastro- vascular cavity. The upper disk containing the mouth and tentacles is not shown.
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