. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. 174 THE CKINOIDKA CAMEBATA OF NORTH AMERICA. Oaiiio^ introduced in the growing Crinoid in great numbers among the primary interradials and interdistichals, and between these and the basals, radials, and brachials. The interrndial and interdistichal spaces throughout this group are greatly depressed, and the plates succeeding the radials folded into conspicuous ridges. This structure, combined with the more or less rudimentary character of the interposed plates, is so unique and remarkable, that all othe
. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. 174 THE CKINOIDKA CAMEBATA OF NORTH AMERICA. Oaiiio^ introduced in the growing Crinoid in great numbers among the primary interradials and interdistichals, and between these and the basals, radials, and brachials. The interrndial and interdistichal spaces throughout this group are greatly depressed, and the plates succeeding the radials folded into conspicuous ridges. This structure, combined with the more or less rudimentary character of the interposed plates, is so unique and remarkable, that all other characters, some of which in other groups are charac- teristic of very distinct families, appear to be subordinated to it, and we are compelled to unite under this family both monocy- clic and dioyclic forms; those in which the radials are all sepa- rated, and those in which they are in lateral contact at four sides. We think that few, after seeing a large number of specimens, will doubt the propriety of this course; for the structure in question pro- duces a habitus so distinct and predominant, that it is only by means of these characters that the three genera of this family can be separated. In our classification of 1885,* we proposed the genus Canistrocrinus upon two species, which according to the descriptions differed from all genera previously known. In defining the genus we relied upon the correctness of the figures; but these have proved to be in some very important points, and we are compelled to withdraw it. As to "Canistrocrinus" liichard- soni {Glijptocrimis liichardsoni Wetherby). we are now convinced that it is a Ghjidocrimis, and identical with Gl///)focriiius siibglohosiis Meek. It has well defined interradials, aiul the anal plate rests vpon the radials, and not between them. The other species, ^'Canistrocrinus" Pattcrsoni {Gli/ptocrimis Puttersoni S. A. Miller), may also prove to be a Oli/ptocrinus. The type specimens, which Mr. M
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