. Animal biology. Zoology; Biology. CHAPTER XXIX PHYLUM CTENOPHORA Sfomodeum ''addle plate Tentacle, Bearing considerable resemblance to coelenterates because of their jelly-like consistency, the ctenophores are considered by many zoologists to be a class of Coelenterata. For reasons which will soon appear, how- ever, it seems more logical to put them in a separate phylum, Cteno- phora (te nof 5 ra; G., ktenos, comb, and phoros, bearing). The cteno- phores are all marine, and the species are relatively few in number. They are widely distributed but are most abundant in the tropics. They are ye
. Animal biology. Zoology; Biology. CHAPTER XXIX PHYLUM CTENOPHORA Sfomodeum ''addle plate Tentacle, Bearing considerable resemblance to coelenterates because of their jelly-like consistency, the ctenophores are considered by many zoologists to be a class of Coelenterata. For reasons which will soon appear, how- ever, it seems more logical to put them in a separate phylum, Cteno- phora (te nof 5 ra; G., ktenos, comb, and phoros, bearing). The cteno- phores are all marine, and the species are relatively few in number. They are widely distributed but are most abundant in the tropics. They are yery transparent and usually delicately tinted with some shade of blue, lavender, or pink. 182. Structure.—A typical cteno- phore is ellipsoidal or nearly spherical in form and possesses eight rows of paddle plates running from one pole to the other (Fig. 70). Each paddle Paddle plafe plate is a projecting shelf formed by the fusion of the bases of cilia which themselves fringe the margin of the plate. When seen from the side the plates resemble the teeth of a comb, which suggests one common name for this group—comb jellies. Because Fig. c'tenophore, Pleuro- ^^^^^ ^""^^ ^f paddle pktes form brachia bachei A. Agassiz, from Puget TOUghened ridges running from one Sound. A, the organism seen from i . .y^ nthpr sompwhaf rp^pmh- the side. Somewhat diagrammatic. P°^^ ^" ^'^^ °^"^^ SOmewnat reSCmO- X i}4- B, diagram of a cross section ling the ridges on a walnut, cteno- the*c^anais!°"''* *° '^°'' *^' ''^^*'°''' °^ P^^^^^ ''^^ often Called sea walnuts. The mouth is at one pole and leads into a stomodeum, which is connected with a series of canals run- ning through the body. On each side is a sac into which may 154 Meridional canal. Tentacle B. 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 o
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