. Bulletins of American paleontology. Middle Ordovician Crinoids: Brower & Veinus 413 Order MONOBATHRIDA Moore and Laudon, 1943 Suborder GLYPTOCRININA Moore, 1952 Family GLYPTOCRINIDAE Zittel, 1879 Remarks. — At present, we are investigating glyptocrinids, and are using multivariate statistics to determine conservative charac- ters, meaningful groups of species, and the evolution of the family. As in the forthcoming volume on crinoids in the Treatise on Inverte- brate Paleontology, we recognize three genera of glyptocrinids (Ubaghs, personal communication). The following generic diagnoses
. Bulletins of American paleontology. Middle Ordovician Crinoids: Brower & Veinus 413 Order MONOBATHRIDA Moore and Laudon, 1943 Suborder GLYPTOCRININA Moore, 1952 Family GLYPTOCRINIDAE Zittel, 1879 Remarks. — At present, we are investigating glyptocrinids, and are using multivariate statistics to determine conservative charac- ters, meaningful groups of species, and the evolution of the family. As in the forthcoming volume on crinoids in the Treatise on Inverte- brate Paleontology, we recognize three genera of glyptocrinids (Ubaghs, personal communication). The following generic diagnoses are preliminary and slightly different from those to be published in the Treatise. Glyptocrinus Hall (1847, p. 281). Type species, G. decadactylus Hall. Arms unbranched, composed of uniserial or cuneiform brachials; arms ranging from two to four per ray; secundibrach 2 is axillary in. A. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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