10 ART. 9.— K. KISHINOUYE : 



high, more or less quadrate, much attenuated in the median 

 parts, and often subdivided into two narrow lobes. The eight 

 adradial tentacles are long, round in cross-section, covered with 

 minute nematocysts on all sides, and about four times as long as 

 the diameter of umbrella. 



The oral tube is about as long as the radius of umbrella 

 and ridged at perradial corners. The oral arms are generally a 

 little longer than the diameter of umbrella. Their lateral lobes 

 are wide and much ruffled along margin. The ridges of oral 

 tube and the mid-ribs of oral arms are covered with nematocysts 

 which are generally small, elongate, and rather crowded. 



The four genital glands are well developed in length, and 

 bulge out as many-lobed sacs. 



Genital glands, margin of oral arms, tentacles, and nemato- 

 cysts on oral tube as well as oral arms are generally violet-colored, 

 while the inner wall of oral tube is yellowish, especially at the 

 perradial corners. 



Young specimens have flatter umbrella, more weakly developed 

 oral arms, and a less number of nematocysts especially in the 

 marginal parts of exumbrella than adults. 



The species occurs in abundance in the Kuroshiwo in warm 

 seasons. It grows to a size of about 60 mm. in diameter of 

 umbrella. Often a soft-shelled barnacle {Anelasma sp.) is found 

 attached to the medusa. Once an immature fish, belonging to the 

 genus Fsenes, was caught together with the medusa, as the two 

 were in association. The fish is about 30 ram. long and has many 

 dark spots on sides. 



As was already remarked by some authorities, the medusœ 

 belonging to the genus Pelagia are very difficult to identify. The 

 principal cliaractars used for specific identification are the shape 



