206 K. KISHINOÜYE, 



thick at the centre and becomes gradually thin towards the margin 

 (Fig. 1). The thickness at the centre is nearly equal to j part of the 

 umbrella diameter. The margin of the umbrella is cut into about 

 130—180 lobes, i. e. in each octant about 14—20 velar lobes be- 

 tween two small ocular lobes (Fig. 5). The number and size of these 

 lobes is very variable, even in different octants of one individual. 

 The velar lobes are oval, while the ocular lobes are somewhat lanceo- 

 late (Fig. 5). 



The exumbrella is smooth, but on the marginal lobes we find 

 numerous minute grooves which run nearly longitudinally (Fig. 5). 



In the subunibrella, the muscles are well developed in the form of 

 circular ridges (Fig. 2 m). The coronal groove is not distinct. The 

 distance between the centre of the subumbrella and the point of attach- 

 ment of the oral pillar is about half the distance between the latter 

 and the umbrella margin (Figs. 1, 2). The four oral pillars (Figs. 1, 

 2 o.p) are about quadrate in form, and they are thick and strong. 

 Between these pillars, there are four subgenital cavities (Figs. l, 

 2 s. c), which are somewhat heart-shaped and almost as broad as the 

 pillars. At the mouth of each cavity and between each two of the 

 oral pillars, there is a large, hemispherical protuberance (Figs. 1, 2 pr). 

 The surface of the protuberance is rough and prickly. 



The oral disc (Figs. 1, 2 o.d) i^ enormously thick and assumes 

 a prismatic form. Its height exceeds the breadth. Its wall is very 

 thick and of a very firm consistence. Eight pairs of scapulets 

 (Fig. 1 scp) originate from the sides of the prism. The upper margin 

 of the scapulets is provided with sucking frills, among which there 

 are numerous hollow filaments. Each scapulet is divided into two 

 parts at the distal end. The sucking frills of the lower surface of 

 the oral disc (Fig. 3) are very characteristic. There they are found 

 as five separate groups — the central cruciforra group and four per- 

 radial 3-rayed groups, and at the centre of each group there is a 

 very long hollow filament (Figs. 1, 3). These five filaments are the 

 longest of all the appendages of this medusa. 



The eight oral arms (Fig. 1 o.ä) are large, stout, triangulär 

 pyramids. The upper portions are coalesced with each other along 

 half their length (Figs, 1, 3). Among the sucking frills of the oral 

 arm there are two kinds of appendages — one filamentous, the other 

 long and conical or rather long and fusiform (Fig. l). These appendages 

 are nou-contractile and have a central canal , which opens at the 

 distal end. The scapulets lack the fusiform appendage. Both kinds of 



