On a collection of Crinoids from the Copenhagen 
Museum. 
By 
Austin Hobart Clark. 
Washington, D. C. — U. S. America. 
The authorities of the Zoological Museum of the Copenhagen 
University have recently done me the honour to entrust to me for 
study a magnificent crinoid collection belonging to that institution. 
Dr. Th. Mortensen had had it in mind for some time to turn his 
attention to the recent crinoids, and to work up the material which 
had been accumulating there; but, learning that the collection 
contained many forms which I had been unable to examine in the 
Course of my studies upon the recent crinoids, he, with the greatest 
&generosity, offered me the privilege of working it up in connection 
with the material in the United States National Museum. I wish 
to record my deep appreciation of the kindness shown me by the 
authorities of the Copenhagen Museum, and especially of the 
generosity of Dr. Mortensen, who, in allowing me to review 
the collection, deprived himself of an exceedingly interesting and 
instructive bit of investigation. 
The Copenhagen collections, apart from their Sinkrilke 
Character, are of great interest in their historic associations. Dr. 
P. Herbert Carpenter, in the preparation of the ,,Challenger" 
Teport upon the free crinoids, visited Copenhagen and made notes 
upon many of the specimens which he recorded in his monograph. 
These notes, taken almost at the beginning of his studies, were 
usually not sufficiently detailed to admit of a definite identification 
of the specimens from them in the light of the much greater know- 
ledge gained in later years, and he. was thus obliged to question 
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