388 The Calceocrinidce. 



XVII. — The Calceocrinidce: A Revision of the Family, luith 

 Descriptions of some New Species. 



BY EUGENE N. S. EIITGUEBEKG^ M.D. 



The confusion existing in regard to the nomenclature of the 

 species included in this family, as well as to the proper terminol- 

 ogy of the component parts of the calyx and arms, makes a com- 

 plete revision imperative. 



The bibliography on the subject will not be reviewed here, since 

 that has ah*eady been done by Messrs. Wachsmuth and Springer 

 in their ^^ Eevision of the Palaeocrinoidea^'; to which those 

 wishing to examine it can refer. 



The first attempt to meet the evident necessity for a separa- 

 tion of the family into more than one genus was made by Mr. E. 

 O. Ulrich, who, in 1886, revised the family, calling it Grema- 

 crinidce, in place of Calceocrinidm already proposed by Meek 

 and Worthen, and then proceeded to divide it into three new 

 groups or genera; — Cremacrinus, Halysiocrinus and Deltacrinus, 

 — totally rejecting the generally accepted genus Calceocrinus 

 Hall, except as a sort of convenient receptacle into which could 

 be thrown all such species as would not readily fall under one 

 or the other of his new genera. 



While acknowledging the fact that the differences exhibited 

 by the various species called for further generic separation, it 

 must be conceded, with Wachsmuth and Springer, that the set- 

 ting aside of the family Oalceocrinidae and genus Calceocrinus 

 was unwarranted. 



A division of the family into several genera is essential for a 

 proper classification of the species contained in it ; and our first 

 step must be, in deference to the general acceptance of the term 

 Calceocrinus, to decide to what type of calceocrinoid structure 

 HalFs original species belongs, before any further divisions are 

 made or others recognized. 



It has been thought preferable to do this under the head of 

 Calceocrinus, in its proper position in the family, instead of 



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