2 ART. y. — K. KISIIINOUYE : 



SCYPHOMEDUS.E. 



Stauromedusse. 



Stenoscyphidae. 



Thaiimatoscyplius^ n. g. 



Stenoscyphidœ with eight principal tentacles transformed into 

 small and slender bodies, not adhesive. 



Thauniatoscyphus distinctus, n. sp. 



(PI. I, Figs. 1, 2.) 



The entire body is goblet-shaped. The calyx is nearly so 

 broad as high. The umbrella-margin is divided into eight short 

 arms. They are nearly equidistant from one another, and so short 

 that they can scarcely be seen from the outer side. The peduncle 

 is nearly equal in length to the calyx, four times as long as 

 broad. The adhesive surface at the aboral end is wide and 

 more or less quadrate. The cavity in the peduncle is divided into 

 four chambers by fusion of the well-developed interradial tseniolse. 



The exumbrella is smooth though beset with small, isolated, 

 rather sparsely scattered nematocysts. There exist some grooves 

 close to and running parallel with the umbrella-margin of the 

 exumbrella. In the subumbrella, there are four, deep, interradial 

 infundibula. The outer surface of mesogonia is beset with many 

 spherical groups of nematocysts of different sizes. Those near the 

 umbrella-margin and the middle parts of mesogonia are especially 

 large, being about 1 mm. in diameter. 



