MUSEUM OF COMPARATIVE ZOOLOGY. 27 



REPORT ON THE ECHINODERMS. 



By Hx'bert Lyman Clark. 



Much of the time during the past year has been given to a 

 continuation of the work on the collection of holothurians. The 

 critical study of more than 200 specimens of Stichopus led to the 

 preparation of a report involving the revision of the genus. A 

 similar study has been made of the Synaptinae, resulting in the 

 discovery of seven undescribed species in the Museum collection. 

 During the spring, the Echini taken by the University of Iowa 

 Barbados- Antigua Expedition were studied and a report prepared. 

 Some time has also been given to further study of the brittle-stars 

 of the Amphiuridae. 



The accessions for the year were about 200 specimens, chiefly 

 from the University of Iowa, through Prof. C. C. Nutting, and from 

 Mr. D. Thaanum of Hilo, Hawaii. Other donors, to whom 

 thanks are due, were Miss Mildred Bush, Prof. G. H. Parker, Dr. 

 A. G. Mayor, the Bermuda Biological Station, Prof. E. L. Mark, 

 Director, and Mr. W. M. L. Wilson. 



