36* ANNUAL KEPORT OF THE 



REPORTS ON THE LOWER INVERTEBRATES. 

 ECHINODERMS. 



By PIubkrt Lyman Clark. 



The labelling and cataloguing of the collections of echinoderms 

 has occupied the greater part of the year. The card catalogue 

 of the starfishes was completed in the winter and showed a 

 collection of 10,400 specimens, representing 85 genera and 344 

 species. Additions during the spring, chiefly by exchange, have 

 increased these numbers, so that at the close of the year there 

 were 93 genera and 387 species in the collection. The catalogue 

 of the sea-urchins was begun and three families (Cidaridae, 

 Saleniidae, Arbaciidae) were completed ; these families are repre- 

 sented by 18 genera, 64 species, and 2,138 specimens. 



In November a List of echinoderms available for exchange 

 was sent to 24 museums. Responses were quite satisfactory, and 

 exchanges have been carried through with the U. S. National 

 Museum (Washington), the Museum of Leland Stanford, Jr. 

 University (Palo Alto, Cal.), the British Museum (London), 

 the Museum d'Histoire Naturelle (Paris), the Zoologiske Museum 

 (Copenhagen), the Australian National Museum (Sydney), and 

 the Otago University Museum (Dunedin, New Zealand). About 

 550 specimens were involved in these exchanges, and our material 

 available for exchange of 25 most desirable species, chiefly from 

 the " Blake" and " Albatross" dredgings, has been exhausted. 



Aside from these exchanges, the only addition to the collection 

 is a series of Cidaridae, chiefly from the Hawaiian Islands and 

 Japan, presented by the U. S. National Museum, in return for 

 the identification of the extensive collections made in the Pacific 

 Ocean by the "Albatross." The series contains 196 specimens, 

 of 22 species and 12 genera, and includes cotypes of 9 recently 

 described species. 



