. Elementary text-book of zoology [electronic resource]. Zoology. ALCYONIUM. 25 Again, the organs, such as muscles, gonads, and gastric filaments, are much more definite. Thirdly, the ccelen- teron is not simple but partially divided thus :â ^ ^A, Gastric cavity for digestion. ;^^,^ cavities â nutritive and vascular, walls form motor (nmscles), skeletal (mesen- teries), and reproductive (gonads) organs. Lastly, the ectoderm is tucked in to form a gullet. At the same time we may note the absence, as in Hydra, cf definite respiratory, excretory and blood-vascular organs. IV.âALCYON
. Elementary text-book of zoology [electronic resource]. Zoology. ALCYONIUM. 25 Again, the organs, such as muscles, gonads, and gastric filaments, are much more definite. Thirdly, the ccelen- teron is not simple but partially divided thus :â ^ ^A, Gastric cavity for digestion. ;^^,^ cavities â nutritive and vascular, walls form motor (nmscles), skeletal (mesen- teries), and reproductive (gonads) organs. Lastly, the ectoderm is tucked in to form a gullet. At the same time we may note the absence, as in Hydra, cf definite respiratory, excretory and blood-vascular organs. IV.âALCYONIUM. Class Sub-Class Order - CfELENTERATA. SCYPHOZOA. ACTINOZOA. OCTACTINIA. I'io- 57.âALCYONIUM DlGLfATUM. Gonad. 0/^, â. Coenosarcal Canal. Longitudinal Muscle. Gullet. Directive Mebenierj*. Ccenosarcal Cana Radial C\'n itv. Spicules. Body-wall of Polype. A, Isolated spicules. B, A section through the entire colony showing the polypes in cross section. (.)(/. nai.) Alcyonium digitatum (Dead Man"s Fingers) may be taken as a type of the colonial Actinozoa. The colony may be fixed at its base to a foreign body and branching like a coral, or it may grow closely adherent to the tube of an annelid or other body. It is found most. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
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