some new scyphomedus:e of japan. 13 



Bhizostomœ. The brachial canal gives off a horizontal branch 

 towards the axis of the body. Such horizontal canals reunite 

 and form a very short crucial canal at the centre of the oral 

 disc (fig. 9). 



The oral arms are one-winged and curved abaxially at the 

 lower half (figs. 8, 9). They are a little longer than the 

 umbrella radius. They are divided into two at the distal end 

 and give off many branchlets in a feather-like manner. The 

 upper arm is nearly equal in length to the lower arm. Among 

 sucking frills, there are many small, short appendages. Those 

 at the junction of the oral suture are longer, triangular in 

 cross-section, and have prickly appearance. 



The umbrella diameter measures 10-20 cm. 



The central dome of the umbrella and the sides of the oral 

 disc have many dark brown dots. Genital glands pinkish ; oral 

 frills brown. A specimen which I have obtained at Senzaki, on 

 the coast of the Japan Sea, had a very beautiful light blue color. 



This medusa is known thus far from Setouchi-umi (Inland 

 Sea) as well as from Misaki and Senzaki. It is found in August 

 and September and is known among fishermen by the name of 

 Yebi-kuragê (shrimp medusa), since a commensal shrimp is often 

 present under its umbrella. 



This medusa is closely related to Cephea, Cotylorhiza and 

 Ncirosoma. 



Pevii'hizct, nov. gen. 



Cepheidse with a deeply divided subgenital cavity, small 

 subgenital ostia and long, numerous appendages among oral frills. 



