24 ART. '). — T. ATDA. 



Even the most common species as Oik. longicauda can not 

 be taken at all times throughout the year. Sometimes, especially 

 in the cold season, when the north wind, i. e., the wind to sea- 

 ward, predominates, the Copelata and other oceanic plankton fauna, 

 if found at all, are exceedingly poor along the Pacific coast. It 

 is always the south Aviiid that brings them there. It is 

 in summer, when that wind prevails and the Black Current 

 sweeps nearer the land than in other seasons, that the Copelata 

 are most richly represented along the Pacific coast of Japan. 



