12 ART. !'. — K. KISHINOUYE : 



each of two adradial outgrowths, ovoid in form and covered with 

 numerous, brown, elongated nematocysts of a minute size. 



The oral tube is short, cruciate in cross-section and has 

 raised perradial edges, thick wall and a narrow convoluted slit. 

 The lower end of oral tube is divided into four well developed 

 oral arms, which are sent out in a nearly horizontal plane or a 

 little reflected toward the aboral side. 



The oral arms are not straight, but are convoluted anticlock- 

 wise, when seen from the oral side. The proximal part of oral 

 arms is pretty thick and broad, and is provided on the margin 

 with a thin, broad and much ruffled hanging parts besides some 

 finger-shaped processes among the oral frills. One lateral moiety 

 of the proximal parts of oral arms is horizontally folded over the 

 other half, so that the oral opening is not wide but is a narrow, 

 oblique and cruciate slit. While the oral arms are very wide in 

 the proximal parts, they are narrow in the remaining greater parts 

 and twist themselves spirally four or five times. When straight- 

 ened out they are about thrice as long as the umbrella-radius. 

 The twisting of arms occurs generally in species of the genera 

 Chrysaora, Dactylometra, etc., a fact which has hitherto been over- 

 looked, except in one extreme case observed by me in a medusa 

 {Chrysaora gilberti^) from the Californian coast. 



The subgenital ostia open merely by radiating slits. The 

 genital glands do not bulge out from these ostia. 



The specimen examined measures about 300 mm. in umbrella- 

 diameter. It was collected by Mr. Hiroshi Katö, while on board 

 of a cod-fishing schooner in the Okhotsk Sea in 1907. Immature 

 cod is often found under the umbrella of tlie species. This species 



*Kishinonye. — A New Medusa from the Californian Coast. Zool. Anzeiger, Bd. XXII. 

 1899. . • 



