20 AKT. 9. — K. KISHINOUYE : 



the genital pouches in the floor of stomach cavity of some forms 

 belonging to the genus Aurelia. 



The vascular system is rather simple. The canals are broad, 

 but not uniform in calibre. There are sixteen radial canals, of 

 which the eight ocular canals are branched, and their branches 

 anastomose with one another. There are three rows of meshes, and 

 in each octant of the umbrella we find a pair of large triangular 

 meshes in the axialmost row and six smaller meshes of irregular 

 shape in each of tlie remaining two rows. The adradial canals 

 are simple, run to the umbrella margin and thence into tentacles. 

 The circular canal sends off a small canal into each velar lobe and 

 each tentacle. So far as I know, the presence of a canal in each 

 velar lobe is quite peculiar to this species, which differs in this 

 respect from all other known species of the Ulmaridse, {Phacellophora 

 excluded), in which the radial canals, except the ocular and 

 tentacular canals, generally terminate in the circular canal. 



The gastric filaments are long and numerous. They grow on 

 the sides of tlie triangular area formed by the genital gland and 

 the oral pillars. 



The oral tube is quadrangularly prismatic, and the oral arms 

 are lanceolate and nearly so long as the umbrella radius. They 

 diverge from the oral tube and are in the distal parts aborally 

 directed. They are thick and keeled along the mid-rib, finely frilled, 

 and are furnished with minute brachial filaments on the margin. 



The four sexual glands are long, narrow bands, consisting of 

 numerous transverse folds. The adjoining glands almost touch 

 each other near the extremities. They form the boundary of the 

 central stomach cavity. 



The subgenital cavities as well as the subgenital ostia are not 

 well marked. The cavities gradually widen from the ostia inwards. 



