SOME MEDUSA OF JAPANESE WATERS. 13 



is nearly allied to, and possibly identical with, Ch. melanaster 

 Brandt. The description and illustration in Brandt's work are 

 incomplete, and the type specimen is not found now. The species 

 here described as new differs from Brandt's in color markings 

 and in the shape of marginal lobes, oral arms, subgenital 

 Ostia, etc. 



Chrijsaova sp. 



In Aniwa Bay, ofip Korsakoft' in Saghalin, I had collected on 

 Aug. 17, 1905, a beautiful medusa belonging to genus Ckrysaora ; 

 but as at that time I had no means to preserve it, I made of it 

 only a rough sketch and a short note. From these I find that 

 the medusa is closely allied to Ch. helvola Brandt, but the 

 marginal lobe is rounded in outline and not dentate as in the 

 latter species. The medusa measured 400 mm. in diameter, the 

 stomach cavity measuring across nearly half as much. The ex- 

 umbrella had numerous nematocysts. On it a star-shaped figure 

 was not found, but in the subumbrella there were observed six- 

 teen (eight ocular and eight adradial) rays of a dark orange- 

 yellow" color. The adradial rays were divided into two at their 

 axial extremity. The tentacles, broad at the insertion, were dark 

 red in color. The oral arms were long and of a light reddish 

 violet color. The subgenital ostium was wide. 



Neopelagin, n, g. 



Pelagidœ with four perradial and four interradial tentacles 

 in the place of eight principal sensory clubs. 



