MEDUSA. 11 
In 1908 Prof. Bedot published a description of a new Coelenterate from the 
Antarctic under the name of Wandelia charcoti; with his assistance I have been able 
to show that it belongs to the genus Hlewtheria. 
I have been able to confirm Dr. Vanhoffen’s statement that the tentacles described 
by Dr. Rennie as belonging to large Antarctic Siphonophores are the tentacles of 
a Desmonema. 
HYDROMEDUS A. 
ANTHOMEDUS. 
Famity CODONIDA. 
Marcetoprsis, Hartlaub, 1897. 1907. 
Generic Character.—Codonide with four perradial groups of tentacles, each with 
two or more tentacles ; with four radial canals ; with gonad encircling the stomach. 
MARGELOPSIS AUSTRALIS. 
(Plate IV., figs. 6 and 7.) 
Description of the Species.—Umbrella bell-shaped, about as broad as high. 
Ex-umbrella covered with nematocysts which are not arranged in groups. Stomach 
cylindrical, nearly as long as the umbrellar cavity. Mouth circular. Four radial 
canals. Gonad completely encircles the stomach and forms a conspicuous globular 
swelling. Four perradial groups of tentacles, each group containing two small tentacles, 
placed one behind the other. 
Size.—Umbrella about 0°75 mm. in width. 
There is only one specimen of this little Medusa in the ‘ Discovery’ collection. 
It was taken on the 29th May, 1903, in McMurdo Sound. The specimen very closely 
resembles Margelopsis hartlaubi, Browne (1903), which inhabits the fjords of Norway 
in the neighbourhood of Bergen. I have not succeeded in finding a good reliable 
character for distinguishing the Antarctic species from M. hartlaubi; this is partly 
due to the minuteness of the specimen, and to its somewhat contracted and crumbled 
condition. 
When the specimens from Norway and the Antarctic are placed side by side they 
look like two distinct species, but the different appearance is mainly due to the shape 
of the umbrella, and to the much larger size of the Norwegian specimen. 
The ex-umbrella of Margelopsis hartlaubi is covered with nematocysts which are 
grouped together into clusters, each cluster containing about a dozen nematocysts. 
The ex-umbrella of Margelopsis australis is covered with isolated nematocysts which 
are not arranged in groups. The stomach of M. hartlaubi has a very thick quad- 
rangular base, which is situated in the jelly above the top of the umbrellar cavity. 
VOL, V. x 
