SOME MEDUSiE OF JAPANESE WATERS. 5 



The oral arms are more or less imited in pairs. The perradial 

 sinuses are deeper and wider than the interradial. Each oral 

 arm has 35-45 capped tentacles with short stalk. The eight 

 transformed, principal tentacles or the marginal bodies are large 

 and globular. Their diameter is nearly as long as that of the 

 peduncle. 



The manubrium is rather short, nearly quadrangular, and 

 rich in longitudinal folds ; it is not much expanded at the margin 

 of the opening. The gastric filaments are long and numerous, 

 arranged in rows on both sides of interradial deltoid muscles. 



The genital glands number eight and are long and narrow 

 in form. They extend from the tip of oral arms to the junction 

 of the peduncle with umbrella. Each gland consists of nearly 

 forty round sacs, arranged in two longitudinal rows. The glands 

 run close by the sides of interradial muscles. 



The ground color of the body is pale yellow, while the anchors 

 and the secondary tentacles are deep yellow, and the genitalia 

 black on the abaxial side. 



The total length of body is about 16 mm., of which about 

 5 mm. is the length of the peduncle. The breadth of umbrella 

 is about 6 mm. 



This species was collected by Mr. Oguma at Oslioro, Hok- 

 kaido, in August 1908, and was sent to me by his teacher. Dr. K. 

 Yendo. Afterwards I have received from Dr. A. Oka a few 

 specimens of this species which were collected by one of his 

 pupils at Dedarubira, quite near Oshoro, in September 1905. 

 An immature specimen, probably belonging to this species, was 

 obtained by Mr. J. Hara at Shirisawabe, near Hakodate in July 

 1900. 



