494 : MR. B, T, BROWND ON [Mar. 17, 
bulbs, without tentacles, one of the bulbs has a short cirrus; and 
also four interradial and eight adradial bulbs, without cirri. Eight 
marginal vesicles, with a single otolith, situated close to the 
perradial canals. 
This medusa is clearly a very early stage, not long liberated 
from a hydroid. The presence of cirri tends to show that it may 
develop into a medusa like Saphenza, or may bud two more ten- 
tacles and become like Zutima. As it resembles Saphenia in its 
present condition, I have placed it here until the hydroid form 
is identified. 
At the end of May 1895 I found two specimens in Valencia 
Harbour. The smaller 4 mm.in diameter. As this medusa has 
been so little described, I give the characteristic points of the 
largest specimen (Pl. XVII. fig. 3):—Umbrella 9 mm. in width and 
5 mm. in length. Manubrium about 10 mm. long. The two 
opposite, perradial tentacles about 15 mm. in length, when fully 
expanded; twelve to fifteen marginal bulbs in each quadrant 
of the umbrella; the tentacles and all the bulbs with cirri. 
Eight marginal vesicles with 3-5 otoliths. The medusa is com- 
pletely colourless, except fora delicate pinkish tinge on the stomach 
and lips. 
Dreneserare Scotland—Firth of Forth, Wright. 
England—Plymouth, Cunningham; Bles; Garstang; H. T.B. 
Isle of Man, Browne. 
Treland—Valencia Island, Z. 7. B. 
OctoRCHIS GEGENBAURI, Haeckel. 
Octorchis gegenbauri, Haeckel (1864) (1879). 
A single specimen of this medusa was taken, for the first time 
in British Seas, at Plymouth on 7th September, 1895. Only two 
species—O. gegenbaurt and O. campanulatus—are known and are 
only recorded from the Mediterranean. The Plymouth Octorchis 
does not correspond exactly to the descriptions given by Haeckel 
of either the above species, but appears to be an intermediate 
form, a kind of connecting link between the two species. As it is 
more like O. gegenbauri, I have placed it under that name. 
Umbrella bell-shaped, 6 mm. in length and 9 mm. in width. 
Manubrium when fully expanded 12 mm. long. Peduncle quad- 
rangular, about five times as long as the stomach; mouth with 
four large, crenate lips. Hight tentacles (4 perradial and 4 inter- 
radial), about 10 mm. long when expanded, about 2 mm. long when 
contracted, without cirri at the base. About 60 bulbs, or warts, 
evenly distributed on the margin of the umbrella, nearly every 
one with short spiral cirrus. Eight marginal vesicles, adradial, 
with 6 to 10 otoliths in two rows. On each of the four radial 
canals, about the middle of the peduncle, there is an oval mass of 
ova, and also a genital band, probably containing spermatozoa, 
extending along the radial canals from the base of the peduncle 
nearly to the margin of the umbrella. Medusa perfectly 
colourless. 
