AGASSIZ AND MAYER: ACALEPHS FROM THE FIJI ISLANDS. 173 
ate outward from the stomach cavity. Four of these tubes are wider than 
the remainder, and lead into 4 of the marginal sense organs. All of the radial 
vessels are connected one with another by means of a broad ring of anastomos- 
ing canals that occupies the peripheral zone of the umbrella. The 4 genital 
organs (ov., Fig. 38) are stretched upon 8 fleshy radii, and serve to separate 
the stomach cavity (S) from the cavity of the sub-genital porticus (s. por.). 
Eight chymiferous tubes spring from the cavity of the stomach, and enter the 
8 mouth arms, where they send off side branches to the suction mouths. These 
tubes also give off side branches that samify and anastomose within the gelati- 
nous lower floor of the sub-genital porticus. - None of these tubes, however, 
enter the cavity of the sub-genital porticus, that is thus sepa rated entirely 
from the gastro-vascular system of the Medusa. The general color of the gelati- 
nous substance of the Medusa is blue. There are numerous deep blue streaks 
upon the apex of the central dome, and a deep blue band runs Around the 
outer surface of the Medusa just above the mouth arms. This band is broad 
and biforked in the regions of the mouth arms. The chymiferous tubes in the 
mouth arms and the radial tubes of the umbrella are deep blue. The tenta- 
cles of the suctorial mouths and the anastomosing chymiferous vessels of the 
umbrella are coffee colored. 
We suddenly came upon a swarm of these Meduse off Vanua Mbalavu 
Tsland on November 25, and in all our subsequent voyaging through the Fiji 
group we never saw another specimen. The Medusæ were accompanied by a 
number of small fish. 
Pseudorhiza Thocambaui,' nov. sp. 
Plate 13, Figs. 40-44, 
Generic Characters2 Pseudorhiza, von Lendenfeld, 1884. Rhizostomæ with 
a single sub-genital cavity. There is a central mouth opening upon the lower 
side of the brachial disk. There are 8 mouth arms, the inner or ventral sides 
of which contain a deep groove. The mouth arms bifurcate, and there is a 
single long filament that arises from the place of bifurcation of each mouth arm, 
making in all 8 filaments, The canal system consists of 16 main radial canals 
and a ring canal. Centrifugally from the ring canal there is an anastomosing 
network of canals, and centripetally there are between two adjacent main radial 
canals about 10 canals running from the ring canal inwards radially. 
Specific Charact 
rs. The bell is hemispherical and 32 mm. in diameter. 
There are 8 marginal sense organs, the sensory portion of which consists of a 
spherical chore of dark brown pigment granules, surrounded by a mass of small 
transparent otoliths (Fig. 41). There are 9 small marginal lappets between 
each successive pair of marginal sense organs. The brachial disk, upon which 
1 Named after Thocambau, king of Fiji. 
2 See Lendenfeld, R. von, 1884, Proc. Linn. Soc. New South Wales, Vol. IX 
p. 292. Also, 1887, Descrip. Catalogue Medusæ, Australian Museum, p. 23. 
