4 



NATURAL HISTORY BULLETIN 



value, and have been of real service to me in the preparation 

 of this report. I have quoted from them very freely but they 

 should certainly be consulted by anyone interested in echino- 

 derms. 



CRINOIDEA 



The collection of crinoids sent to me consists of 1310 speci- 

 mens, representing 13 species, but unfortunately Cocometra 

 hagenii makes up nine lots totalling 1247 specimens, while six 

 of the species are represented by only one specimen each. There 

 are 20 specimens of three species of stalked crinoids, while a 

 fourth species is represented by a photograph of a fine example 

 in the Iowa University Museum, identified by Dr. Charles 

 Wachsmuth, the eminent authority on fossil crinoids. It gives 

 me great pleasure to acknowledge the help I have received from 

 my friend, Mr. Austin H. Clark of the United States National 

 Museum, whose admirable work on the crinoids, has made all 

 workers on echinoderms, his permanent debtors. Mr. Clark 

 was good enough to look over the collection one afternoon when 

 he was in Cambridge and he has also helped me by correspond- 

 ence. He must not be held responsible however for any errors 

 of identification which may hereafter be found or for any of 

 the statements made herein. I have followed the arrangement 

 of genera and species given in his ''Recent Crinoids of the 

 British Museum" (1913, Smith's Misc. Coll., 61, no. 15) so 

 far as possible. 



I have ventured to give a key to the 14 species listed here, 

 not because it can be of permanent value but in the hope that 

 since it includes the more common species, it will be of a little 

 help to collectors not acquainted with crinoids in sorting col- 

 lections made in the West Indies. Of course, the key cannot be 

 relied on to lead to correct identifications since the number of 

 crinoids now known from the West Indies is several times 

 fourteen, but it will at least suggest to a beginner the charac- 

 ters which are of general service in distinguishing genera and 

 species of this difficult group. All lovers of echinoderms are 

 awaiting impatiently Mr. A. H. Clark's systematic monograph, 

 which will be to the crinoids what Mr. Agassiz's Revision has 



