14 ART. 7. — K. KISHINOUYE. 



Gelatinous wall of the oral disc entirely destitute of gastrovascular 

 canals. Oral arms three-winged. 



Perirhiza nemalophora , now sp. 

 (Figs. 11-13.) 



The umbrella is hood-shaped. Its central dome is very high 

 und covered with many large and numerous small conical warts, 

 about thirty in number. Many of the warts are bent or crooked 

 near the apex. Larger warts are situate in the centre of the 

 umbrella, while smaller ones are chiefly found near the foot of 

 the dome and sometimes also scattered between or upon the 

 larger warts. The umbrella is thickest at the groove separating 

 the central dome from the peripheral hanging portion. 



The umbrella margin is divided into from eighty to ninety 

 lobes, i. e. s there are eight or nine oblong velar lobes between 

 every two ocular lobes, which are very small and much receded 

 from the general umbrella margin. The velar lobes in each 

 octant are united by a thin membrane as is the case in some 

 species of the genus Cephea (fig. 13). 



In the subumbrella we find thickly crowded and well 

 developed muscular ridges running radially. At the axial part 

 of the brim the radial muscles disappear, while instead circular 

 muscles present themselves (fig. 13). 



The oral disc, octagonal in outline, is not distinct, as the 

 subgenital ostia are very small and compressed and the oral 

 pillars, short, broad and inconspicuous. Its oral side is strongly 

 vaulted upwards ; the gelatinous wall forming it is destitute of 

 the gastrovascular system, which is a remarkable fact. The central 

 portion of the oral side of the disc is free of the sucking frills. 



