. Bulletin - United States National Museum. Science. MONOGEAPH OF THE EXISTING CRINOIDS. 273 very gradually so that they are much stouter than the delicate groovetl pinnules; at first thoy lie horizontally, but in their distal tliird or half they curve dorsally into the form of a hook or spiral, exactly as do the cirri, formuig tondril-hko attach- ments all along the arm whereby the animal fixes each arm securely to the organisms en the sea-floor in addition to fixing its central portion by moans of its cirri. The segments of the stout grooveless pinnules are produced dorsally into blunt rouin
. Bulletin - United States National Museum. Science. MONOGEAPH OF THE EXISTING CRINOIDS. 273 very gradually so that they are much stouter than the delicate groovetl pinnules; at first thoy lie horizontally, but in their distal tliird or half they curve dorsally into the form of a hook or spiral, exactly as do the cirri, formuig tondril-hko attach- ments all along the arm whereby the animal fixes each arm securely to the organisms en the sea-floor in addition to fixing its central portion by moans of its cirri. The segments of the stout grooveless pinnules are produced dorsally into blunt rouinded processes exactly resembling the dorsal convex swellings on the outer cirrus segments; these arc perfectly smooth with no trace of spines. These pro-. Fio. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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