10 ART. 7. — K. KISIIINOUYE. 



its oral side is to be seen the peculiar figure formed by the 

 combination of several grooves, which is of such general occur- 

 rence in medusae of the Pelagidœ and the Cyaneidœ. Centrally 

 there is a sixteen sided polygon, the diameter of which is about 

 half that of the central gastric cavity. From each angle of the 

 polygon a groove radiates toward the umbrella margin. These 

 radial grooves alternate with the partition walls between the 

 radial pouches. 



The genital glands are four in number. Each gland is much 

 folded and bent like the Greek letter to. 



The gastral filaments are many and long. 



Diameter of the umbrella 85 mm.; its height 30 mm. The 

 unique specimen, on which this new species is based, was obtained 

 at Misaki in 1900. 



RHIZOSTOM^. 

 Cepheidse. 



Rhizostoma3 with cup-shaped umbrella which consists of a 

 central dome, generally covered with warts or furnished with 

 radial furrows, of a circular groove and a broad brim. Radial 

 muscle-fibres conspicuous. Subgenital cavities generally four in 

 number, but sometimes coalesced into one. Subgenital ostia to 

 the cavity are very small. Network of the canal system narrow. 

 Radial canals numerous. No circular canal. Oral arms generally 

 one- winged. 



It was necessary to make some alterations in the family 

 character in order to receive the new forms of medusa next to 

 be described. Notwithstanding that these show many novel points 



