. Echinoderms of Connecticut . FIG. i. Transverse section of a decalcified ray of a young starfish, showing the relations of the internal organs. The two ampullae (amp) open by wide canals into the tube-feet (t), the water supply of which is provided by the radial canal (re). The openings into the ampullae from the radial canal are furnished with delicate valves, as indicated, which pre- vent the back flow of the water when the ampullae are contracted and the tube-feet extended. Beneath the radial canal are the two radial perihaemal vessels (rv), separated by a vertical septum, and beneath the
. Echinoderms of Connecticut . FIG. i. Transverse section of a decalcified ray of a young starfish, showing the relations of the internal organs. The two ampullae (amp) open by wide canals into the tube-feet (t), the water supply of which is provided by the radial canal (re). The openings into the ampullae from the radial canal are furnished with delicate valves, as indicated, which pre- vent the back flow of the water when the ampullae are contracted and the tube-feet extended. Beneath the radial canal are the two radial perihaemal vessels (rv), separated by a vertical septum, and beneath these is the radial nerve-cord (n), which extends from the circum-oral nerve to the tip of the ray. Sections of the spines (s), branchiae (b), and pedicellariae (p) are indicated. The pyloric cseca (h) are attached by mesenteries to the dorsal wall of the ray. The spaces between the organs constitute the ccelom (c), and are in life filled with a fluid somewhat resembling the blood, and like it containing floating corpuscles.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherhartf, bookyear1912
