JOURNAL OF THE COLLEGE OF 301ENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXIII., ARTICLE 5. 



Appendicularia of Japanese Waters. 



By 

 T. Aida, RigahisU. 



With 4 plates. 



On every opportunit}^ I have had for visiting the sea coast 

 during the Last five years, I have devoted a part of my time to 

 the collecting of Appendicularia. Up to date, I have found 12 

 species, 7 of which belong to the genus Oihojileura, o to Fritil- 

 laria, 1 to Stegosoma, and 1 to Koioalevshia. A majority of these 

 are known species, but three species of Oihophura and one of 

 Fh'itillaria seem to be new to science. 



It will not be suj)erfliious, I think, to describe in the follow- 

 ing all the species taken, though some of them are the same as 

 Atlantic species and are fully described. The Copelata of the 

 Pacific Ocean are poorly known to the world and slight differences 

 may be found between the Pacific and the Atlantic forms which 

 are nevertheless undoubtedly the same species. 



Owing to the fact that nearly all of the older literature on 

 Appendicularia are inaccessible to me, I am obliged to refer only 

 to the monographic work of Lohmann — " Die Appendicularien " 

 (Ergebnisse der Plankton Expedition) — and Fol's " Appendiculaires 

 du détroit de Messine " and have strictly followed Lohmann's 

 classification. J. E. AV. Ihle's paner on the anatomy and sys- 



