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AGASSIZ AND MAYER: ACALEPHS FROM THE FIJI ISLANDS. 165 
each quadrant. The velum is well developed. There are 4 straight radial 
tubes, upon the lower portions of which, near to the circular tube, the gonads 
are situated. The gonads are folded in a sinusoidal curve alternately to the 
right and Jeft of the radial tube. The proboscis is cruciform in cross section 
(see Fig. 16), and the lips are prominent. Green pigment spots are found in 
the ectoderm of the basal bulbs of the tentacles, and also upon the radial tubes 
close to their junction with the proboscis (Fig. 16). The entoderm of the 
radial tubes in the region of the gonads is tinged with green. The ectoderm 
of the bell margin is of a delicate rose color, and the proboscis and gonads are 
brown. 
This Medusa was common in Suva Harbor late in December. It is more 
closely allied to the species described by Murbach? from Wood’s Hole, Massa- 
chusetts, than it is to Gonionemus vertens, A. Agassiz, of the Gulf of Georgia, 
Washington. 
Aglaura prismatica, Maas. 
Plate 4, Fig. 13. 
Aglaura prismatica, Maas, O., 1897. Mem. Mus. Comp. Zod]. at Harvard Coll., 
Vol. XXIII. No. 1, p. 24, Pl. ITI. Figs. 4, 5. 
Lessonia radiata? Eydoux, F., et Souleyet, L., 1841-52, Voyage de la Bonite, 
Vol. II. p. 643, Zodphytes, Pl. II. Fig. 16. 
Generic Characters. Aglaura, Péron and Lesueur, 1809. Aglauride in which 
the 8 gonads are situated upon the peduncle of the proboscis, directly over the 
points of juncture of the 8 radial canals with the gastric portion of the pro- 
boscis. There are numerous tentacles, and 8 otocysts. 
Specific Characters. ‘The bell is about 3 mm. in height, and about as broad 
asitis high. The walls, although rigid, are exceedingly thin. The side walls 
of the bell are vertical, and the top is quite flat with, however, a slight apical 
projection. There are about 60 tentacles that are so fragile that they were 
broken off short in every specimen observed by us. There are 8 elub-shaped 
otocysts, situated midway between the 8 radial canals. Each otocyst contains 
a single otolith. The velum is very large and powerful, and it is chiefly by 
means of its rapid movements that the Medusa is enabled to dart. through the 
water. The 8 radial tubes are straight, and very narrow. The proboscis is 
flask-shaped, and provided with a well developed peduncle. There are 4 
prominent cruciform lips. The 8 sausage-shaped gonads: project outward 
from the sides of the peduncle at the point of juncture of the 8 radial tubes 
with the gastric portion of the proboscis. The gonads and entoderm of the 
proboscis are usually brownish red in color. Some specimens, however, are 
almost transparent. The Medusa was very common among the Fiji Islands. 
Maas, 1897, has figured a Medusa from the Gulf of Panama that we believe 
to be identical with our Fijian form. The differences between our figure and 
1 Murbach, L., 1895, Journ. Morphol., Boston, Vol. XT. p. 493. 
2 Agassiz, A., 1865, North American Acalephe, p. 128, Figs. 197-200. 
