CONTEIBUTIONS TO THE NATURAL HISTORY OF THE 

 COMMANDER ISLANDS.' 



No. XIII. — A NEW SPECIES OF STALKED MEDUSAE, HALICLYSTUS 



STEJNEGERI. 



By K. KiSHiNOXTYE, 



Imperial Fislie7'ies Bureau, Tokyo, 



A large number of medusre, belonging to the very interesting family of 

 Stanromedusa?, were collected by Mr. Leonhard Stejueger at Nikolski, 

 Bering Island, one of the Commander Islands, during the summer of 

 1897. These medusiie were preserved in formol and still remain in 

 excellent condition. They belong to a single species of the genus Hali- 

 chjstus. So far as I am aware, there are only three known species of this 

 genus, and all of them are from the Atlantic coast. The species, how- 



' The following " Coutributions to the Natural History of the Commander Islands" 

 have been published in these Proceedings thus far: I. Leonhard Stejneger: Notes 

 on the natural history, including descriptions of new cetaceans, XI, 1883, pp. 

 58-89. II. Leonhard Stejneger: Investigations relating to the date of the exter- 

 mination of Steller's Sea-Cow, VII, 1884, pp. 181-189. III. W. PI. Dall: Eeport on 



the mollusca of the Commander Islands, Bering Sea, collected by Leonhard Stejneger 



in 1882 and 1883, VII, 1884, pp. 340-349, pi. ii. IV a. Asa Gray: Notes upon the 



plants collected on the Commander Islands (Bering and Copper islands) by Leonhard 



Stejneger, VII, 1885, pp. 527-529. IV B. Leonhard Stejneger: Additional notes on 



the plants of the Commander Islands, VII, 1885, pp. 529-538. V. Frederick W. 



True : Description of a new species of Mesoplodon, M. stejnegeri, obtained by Dr. Leon- 

 hard Stejneger, in Bering Island, VIII, pp. 584, 585, pi. xxv. VL W. H. Dall, 



Report on Bering Island mollusca collected by Mr. Nicolas Grebnitzki, IX, 1886, pp. 



209-219. VII. Leonhard Stejneger: Revised and annotated catalogue of the birds 



inhabiting the Commander Islands, X, 1887, pp. 117-145, pis. vii-ix. VIII. George 



Vasey : Description of Alopecttrus stejnegeri, a new species of grass from the Commander 



Islands, X, 1887, p. 153. IX. W. Lilljeborg: On the Entomostraca collected by Mr. 



Leonhard Stejneger on Bering Island, 1882-83, X, 1887, pp. 154-156. X A. Leon- 

 hard Stejueger: Contributions to the history of Pallas's Cormorant, XII, 1889, pp. 



83-88. X B. F. A. Lucas: Description of some bones of Pallas's Cormorant (Phala- 



crocoraxperspicillatus), XII, 1889, pp. 88-94, pi. ii. XL F. A. Lucas: The cranium 



of Pallas's Cormorant, XVIII, 1895, pp. 717-719, pis. xxxiv, xxxv. XII, Tarletou 



H. Bean and Barton A. Bean: Fishes collected at Bering and Copper islands by Nik- 

 olai A. Grebnitzki and Leonhard Stejneger, XIX, 1896, pp. 237-251. 



Proceedings U. S. National Museum, Vol. XXII— No. 1 188. 



125 



