164 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
diameter of the bell. The proboscis is flask-shaped, and there are 4 flanged 
lips. The genital organs, tentacles, and proboscis are slightly opaque and 
bluish in color. 
Several specimens, Suva Harbor, January, 1898. 
Staurodiscus nigricans, nov. sp. 
Plate 4, Figs. 11, 12. 
Generic Characters. Staurodiscus, Haeckel, 1879. Leptomeduse without oto- 
cysts, but with clubs between the tentacles. There are 4 radial canals, each of 
which gives rise to a pair of lateral canals. The gonads are situated upon the 
canals. ' 
Specific Characters. The bell is thin and flexible, and is 14 mm. in diameter. 
There are 12 short tentacles having well developed basal bulbs. Between each 
successive pair of tentacles there are 7 knot-like protuberances upon the bell 
margin, each one of which bears a sensory club. The velum is insignificant in 
size. Each of the 4 radial canals gives rise to a pair of lateral branches ; and 
thus 12 canals reach the circular vessel. The gonads are developed upon these 
canals (see Fig. 11). The proboscis is very short, and the mouth opening wide. 
The gelatinous substance of the bell has a brownish tinge. The genital organs, 
basal bulbs of the tentacles, and the proboscis are light sepia in color. The 
bulbs of the sensory clubs are dark brown. 
Single specimen, captured in an open tow-net that was drawn from 100 
fathoms, three miles south of the entrance of Suva Harbor, December 11, 
1897. 
This form differs from the two Atlantic species of Staurodiscus described by 
Haeckel (1879, Syst. der Medusen, pp. 145, 146) chiefly in that the side branches 
of the 4 radial canals reach the circular canal, whereas in the Atlantic forms 
they end blindly. 
Gonionemus suvaensis, nov. sp. 
Plate 5, Figs. 14-16. 
Generic Characters. Gonionemus, A. Agassiz, 1865. Trachomeduse, not 
Leptomeduse (see Haeckel, 1879, Syst. der Medusen, p. 146), with numer- 
ous sucker bearing tentacles that are all similar each to each. There are oto- 
cysts situated between the tentacles. The gonads are sinusoidally folded, and 
are situated upon the 4 radial canals. The proboscis is cruciform in cross sec- 
tion, and the lips are prominent. 
Specific Characters. The bell is flat and of moderate thickness. It is about 
three times as broad as it is high, and is 8 mm. in diameter. There are about 
70 long, stiff tentacles. The proximal portion of each tentacle is straight, but 
near the free end there is a small sucking disk, and beyond this the tentacle 
makes a sharp bend (see Figs. 14,15). There are about 16 otocysts, 4 in 
