28 ANNUAL REPORT OF THE 



REPORT ON THE ECHINODERMS. 



By Hubert Lyman Clark. 



The work of the year has been about equally divided between 

 the collections of Echini and ophiurans. The rearrangement of 

 the spatangoid Echini has been completed; the unidentified 

 material has been determined, a few as yet undescribed forms have 

 been critically studied and the pedicellariae of all the genera and 

 most of the species have been microscopically examined. This 

 work has been done for the sixth and last portion of the report 

 on Hawaiian and other Pacific Echini. 



The entire collection of ophiurans has been rearranged to con- 

 form with the catalogue published (Mem. M. C. Z., 35, no. 4). 

 All type material has been conspicuously designated in both the 

 collection and the card catalogue. The work has involved the 

 rewriting of many cards and labels, but has added greatly to 

 the practical usefulness of the collection. 



During March and April, I was granted leave of absence for a 

 trip to Tobago, B. W. I., as one of a party sent out by the Carnegie 

 Institution of Washington. We were located for five weeks near 

 the extensive coral area known as Buccoo Reef. This proved a 

 very rich ground for echinoderms and 75 species were collected, 

 of which about one fourth are new to the Museum. Nearly two 

 thousand specimens were gathered, including good series of a 

 number of species hitherto only meagrely represented in the 

 collection. This material has all been sorted and mostly identified, 

 but has not yet been incorporated with the catalogued series. 



During the year, important collections for study have been 

 received from the University of Iowa, the South African Museum 

 at Cape Town, and the South Australian Museum at Adelaide; 

 duplicate series from these are to be retained. A small exchange 

 with the Marine Biological Laboratory, Woods Hole, Mass. has 

 given us some desirable brittle-stars, and very welcome gifts of 

 starfishes, brittle-stars, and sea-urchins have been received from 

 Mr. John W. Mills, and the Bermuda Biological Station for 

 Research. 



