34 ANNUAL REPORT OF THE 



REPORT ON THE ECHINODERMS. 



By Hubert Lyman Clark. 



A large part of the year has been given to the labeling and cata- 

 loguing of the holothurians. The completed catalogue shows 

 fewer than three hundred species in the collection but twenty-two 

 of these are represented by the holotypes and there are nearly a 

 hundred others of which we have cotypes. The very great addi- 

 tion to the collection of Echini necessitated a large amount of 

 labeling and cataloguing, and some changes in the storage of that 

 section were also found advisable. 



Dr. R. T. Jackson's remarkable collection of recent Echini, 

 received last year, contains 120 species, many of them represented 

 by hundreds of specimens, most of which have been critically 

 studied. There are more than 27,000 specimens, hundreds of them 

 being variants selected as showing some special peculiarity. Some 

 of these are very choice, notably those which show a 4-rayed or 

 6-rayed symmetry instead of the parts being in five as usual. The 

 value of the collection is further enhanced by the large number of 

 specimens which are figured in Dr. Jackson's monograph. Several 

 species were new to our collection and one of these is represented 

 by the holotype. Gifts were received from Messrs. George P. 

 Farran, W. F. Clapp, D wight Blaney, and George Nelson. A 

 small but very valuable lot of echinoderms from the Kermadec 

 Islands and a collection from Victoria were purchased. Important 

 exchanges were carried through with the National Museum, Wash- 

 ington, the Australian Museum, Sydney, and the Musee Zoologique 

 de PAcademie Imperiale des Sciences, St. Petersburg, which added 

 one genus and fifteen species to the collections. 



In February and March I worked for six weeks at Montego Bay, 

 Jamaica, by the kind invitation of Dr. A. G. Mayer, Director of 

 the Marine Biological Department of the Carnegie Institution, 

 Washington. Special attention was given to the postlarval 

 development of brittle-stars and a large amount of material was 

 gathered which will make possible the solution of some problems 

 in the history of that group. In connection with this work more 



