SOME MEDUSA OF JAPANESE WATERS. 25 



The circular canal is narrow, simple, and divided into minute 

 branches. The sexual glands are four interradial bags with longi- 

 tudinal folds, hanging down around the manubrium. No mesen- 

 terium. The tentacles number many hundreds, closely arranged 

 in two alternating rows ; they are slender but swollen near 

 base. 



I have collected this species on the east coast of Poromushiri 

 in November 1904. 



Margelidae. 



Li^zia sliiinilxO, n. sp. 



(PI. V, Fig. 24.) 



The umbrella is bell-shaped, slightly higher than broad. 

 The manubrium, quadrangularly pyramidal in shape, is nearly 

 half as long as the height of umbrella. It is on a short gastric 

 peduncle. The oral lobes are prominent, each terminating with 

 two oral styles. There are eight (four perradial and four inter- 

 radial) red spots on the umbrella-margin, each bearing a group 

 of three or four short tentacles. The perradial spots are larger 

 than the interradial, and the tentacles of perradial groups are 

 longer than those of interradial groups. Two medusiform buds 

 are found at each perradial corner at the base of manubrium. 

 The aboral buds are older. 



This species is small, measuring only about 2 mm. in diameter. 

 The manubrium and the medusiform buds are pinkish, the re- 

 maining parts almost colorless and transparent. 



Found at Misaki, in Hamana Inlet, and in the Bay of Omura. 

 Quite numerous in winter. Its vulgar name is "shimiko." 



