. Bulletin - United States National Museum. Science. REVISION OF PALEOZOIC STELLEROIDEA. 269 Genoholotyi^e.—O.Jlexilis Mook and Worthcn. For generic description, see imder O.Jlexilis. RemarTcs hy Gregory.--"This interesting genus has hitherto been placed among the Eiiryalida3, of which it has been regarded as the best known fossil representative. As Prof. Bell, however, lias remarked, Meek and Worthen's clear figures of the vertebral ossicles show that the articular surfaces are StreptospondyluK^ and not Cladophiuroid." Schoudorf in 1909 restudied Onycliaster in detail, and came to t
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. Bulletin - United States National Museum. Science. REVISION OF PALEOZOIC STELLEROIDEA. 269 Genoholotyi^e.—O.Jlexilis Mook and Worthcn. For generic description, see imder O.Jlexilis. RemarTcs hy Gregory.--"This interesting genus has hitherto been placed among the Eiiryalida3, of which it has been regarded as the best known fossil representative. As Prof. Bell, however, lias remarked, Meek and Worthen's clear figures of the vertebral ossicles show that the articular surfaces are StreptospondyluK^ and not Cladophiuroid." Schoudorf in 1909 restudied Onycliaster in detail, and came to the folio vving conclusions: " Onychaster jlexilis shows plainly in the structm'o of its arm ossicles that it belongs to the Ophiuroidea. As in this subclass, so also m OnijcTiaster the arm ossicles originated from two halves (ambulacrals) that grew tightly together. "When compared with living Ophiurids, this. 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 work.. 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.