3i8 DISCOVERY REPORTS 



stricted immediately above the mouth, which is expanded, quadrangular, with a cross- 

 shaped orifice, and with four short lips just indicated. The mouth rim is not folded, but 

 carries a narrow band of nematocysts. The radial canals are tube-like and conspicuous; 

 the ring canal is very broad. 



The gonads are oval hollow sacs, hanging down from the radial canals. In the type 

 specimen the ova are fairly large, but not quite ripe, and the gonads are separated from 

 the base of the stomach by about their own length (Plate XVIII, fig. 17). In the smallest 

 specimens the gonads are very small, almost globular in shape, and placed very close to 

 the base of the stomach (Plate XIX, figs. 6, 7), indicating that in still younger stages 

 they are in direct connection with the stomach wall, as in Aglauropsis and Ostroumovia. 

 The gonads are not divided in the median line on the lower side. 



The tentacles (Plate XVIII, fig. 18) are more or less contracted. The perradial ten- 

 tacles are about twice as broad as the ordinary tentacles, of equal thickness throughout 

 their length. They are hollow, with a central cavity about one-third the diameter of the 

 tentacle, surrounded by a thick endodermal epithelium. The ectoderm, which contains 

 some few scattered nematocysts, is very thin except at the apex which is developed into a 

 powerful adhesive disk, vaulted or sometimes concave in shape, and with slight furrows 

 (Plate XVIII, fig. 19). The ordinary tentacles are twenty-four in number in all specimens ; 

 in most of them they are more or less curved inward, but in a few specimens they 

 are moderately extended and are then a little longer than the perradial tentacles ; they 

 taper gradually in thickness from the base towards the tip, and contain a central cavity 

 except in their outermost portion, where the endoderm is solid, consisting of one row 

 of cells. These tentacles have numerous bands of nematocysts, forming high transverse 

 ridges ; but the ridges are only on the outer side of the tentacle, clasping round one- 

 half to three-fourths of its circumference, and not extending quite over the inner side. 

 There is also a very small terminal cluster at the end of the tentacle. At the base of all 

 the tentacles, including the perradial, there is a basal bulb, situated on the inner side 

 (Plate XVIII, fig. 18). The bulb is fairly large, globular, and probably contains nemato- 

 cysts. The outer side of the tentacle, opposite to the basal bulb, is attached to the margin 

 of the umbrella. The arrangement and the shape of the basal bulbs are like those of 

 Aglauropsis, Gonionemiis, and other genera of Olindiidae. 



The statocysts are at the base of the tentacles, adjacent to the ring canal (Plate XVIII, 

 fig. 17). In the type specimen fifteen statocysts could be counted, but probably sixteen 

 are present. To judge from their size, it is suggested that the medusa has only four 

 statocysts in its earliest stage, then eight, and the others appear later between the 

 previous ones ; this supposition is confirmed by the smaller specimens, in which only 

 two statocysts could be detected in each quadrant, one large and one very small. The 

 statocyst is a circular vesicle with a single statolith. The position, size, and appearance 

 of the statocysts are similar to those in Aglauropsis. 



The velum is very broad, its central opening being scarcely one-third of the diameter 

 of the umbrella margin. 



