16 ART. 9. — K. KISHINOUYE : 



with Pelagia panopyra. This circumstance and also tho color of 

 the medusa tend to show that the species is pelagic in habit. 



Cyaneidae. 

 Cj/anea citrea^ n. ^^. 



(PI. IV, Figs. 16, 17.) 



The umbrella is flat, discoidal, thick in the central parts, 

 about one fifth as thick as the umbrella-radius. This radius is 

 about 2 h times as long as that of the central stomach. The 

 umbrella-margin is divided into thirty-two lobes, as each ephyra- 

 lobe is divided into two lobes by a shallow notch. All the lobes 

 are rounded in the free margin. 



The gastrovascular system is well developed. The peripheral 

 branches of radial pouches are mostly dendritic but seldom anasto- 

 mose with one another. The radial pouches and their branches oc- 

 cupy nearly the whole surface of subumbrella. The ocular pouch is 

 nearly rectangular, while the tentacular pouch is narrow on the axial 

 side but gradually broadens towards umbrella-margin and is about 

 twice as broad as the ocular pouch at the level of sensory clubs. 



The sharp grooves in the roof of the gastrovascular system 

 are rather simple, and divide the roof into a central region and 

 sixteen peripheral regions by one circular, eight ocular and eight 

 adradial grooves. 



The oral arms or curtains are very fine and complicated. 

 They diverge from the oral tube nearly horizontally, their 

 abaxial tips being bent clockwise, when seen from the oral 

 side. They are shorter than umbrella-radius and are divided 

 into great many lobes, which are very narrow at the abaxial tip 

 but gradually increase in breadth and length towards the middle 



