Hydromeduse of Torres Straits, Australia. 201 
tentacle bulbs are simple and are not flanked by cirri, and their entodermal cores 
do not project inward into the gelatinous substance of the bell. The hydroid 
is Campanulina Van Beneden. 
Phialidium pacificum Maas. 
(Plate 2, Fig. 3.) 
Phialidium pacificum, Maas, 1906, Revue Suisse de Zool., tome 14, p. 91, plate 2, fig. 7. 
Specimens of this medusa were fairly common in surface tows taken off the 
Murray Islands, Torres Straits, Australia, in September and October. When 
mature the bell was flatter than a hemisphere, thin-walled, and about 4.25 to 
5 mm. in diameter. In an average mature female there were 43 tentacles, all 
similar each to each and about half as long as the bell-radius. There were 26 
small spherical lithocysts, each with a single concretion. 'The manubrium was 
small and with 4 simple lips, and the 4 swollen gonads occupied somewhat more 
than the middle thirds of the 4 slender radial-canals. The entoderm of the 
manubrium, gonads, and ring-canal was dull green to light grass-green. In 
some medusze the entodermal lamella of the bell was green, but in others it was 
transparent and colorless. 
A comparison between the figures of this medusa from Torres Straits and 
one from the Mediterranean shown in figure 148, page 268 of Mayer’s ‘““Medusze 
of the World,” will show that the two are identical in all essential respects. 
Moreover, it will be recalled that Calkins (1899, Proce. Boston Soc. Nat. Hist., 
vol. 28, p. 349) described a hydroid from Puget Sound, Pacific coast of North 
America, which appears to be identical with the hydroid of Phialidium hemi- 
sphericum of the Atlantic, and Murbach and Shearer record a medusa from 
Puget Sound which may be derived from this hydroid. In fact were our 
Murray Island medusa found in the Mediterranean or off the coasts of Europe, 
we would at once call it Phialidium hemisphericum; if off the American coast, 
P. languidum, and if in the Tropical Pacific, P. pacificum. These names 
merely express the doubt that still exists respecting the specific identity of 
the hydroids of these meduse, for no differences can be detected between the 
mature meduse themselves. 
When young, this Torres Straits medusa passes through a stage wherein there 
are 16 short, equally developed tentacles, 32 lithocysts, and 4 small gonads 
near the ring-canal. 
Genus EUTIMA McCrady, 1857. 
Eutima, McCrapy, 1857, Gym. Charleston Harbor, p. 87. 
GENERIC CHARACTERS. 
Eucopiide with 8 lithocysts, 2 in each quadrant, and with 4 or more well- 
developed tentacles, and numerous rudimentary tentacles, marginal cirri, or 
both. Stomach mounted upon a well-developed gelatinous peduncle. The 
4 or 8 linear gonads are developed upon the 4 radial-canals. The hydroid 
is Campanopsis. 
Eutima australis noy. sp. 
(Plate 3, Fig. 5.) 
This medusa was common in surface tows off the Murray Islands, Torres 
Straits, Australia, in September and October 1913. The bell is flatter than a 
hemisphere and the gelatinous substance is thin and tenuous. There are 4 
perradial tentacles each about as long as the bell-radius and with laterally 
