1896.] BRITISH HYDROIDS AND MEDUS2. 485 
four radiating vessels, with a long, linear, somewhat clavate ovary, 
of a bright pink colour, commencing very near the centre, and 
terminating close to the margin in the course of each. The 
stomach is very short, but wide, of a rose colour, and has four 
lanceolate, fimbriated lips, bordered by a compact edging of 
fibrous cells.” 
Gosse’s description differs slightly from that given by Forbes. 
His specimens appear to belong to a younger stage, about three- 
quarters of an inch in diameter, and with about fifty tentacles. No 
mention, however, is made of the ‘‘minute epidermic hairs composed 
of fibrous cells” near the margin of the umbrella. The following 
is the description given by Gosse of the marginel vesicles :— 
‘** Besides these organs (tentacles), the margin is furnished with 
others ..... They consist of cells, usually more or-less glovose, 
each containing one or more spherical bodies of high refracting 
power. Prof. Forbes has not noticed them in his description of 
this species ; they are, however, large and peculiar: first in shape, 
being semi-elliptical swellings of the substance of the marginal 
canal, and secondly in the number of their spherules. The 
spherules are arranged in a double crescentie row, those which 
form the middle being generally larger than those at the 
extremities. The capsules are eight in number, two in each 
quadrant, nearly equally distributed ; but not holding any fixed 
relation of position to the tentacles.” 
The specimens which I took at Valencia have not only the cirri 
on the margin of the ex-umbrella (=“ minute epidermic hairs 
composed of fibrous cells”) as described by Forbes, but also the 
eight adradial marginal vesicles with numerous otoliths, as described 
by Gosse. The other details of the species agree with the 
description given by Forbes and Gosse. 
An early stage was taken at Valencia on May 4th. Umbrella 
bell-shaped, 2 mm. in length and width. Four perradial and four 
interradial tentacles; and also eight adradial bulbs, from which 
tentacles will develop in a later stage. A few cirri on the margin 
between the tentacles and bulbs, but none on the edge of the ex- 
umbrella, Hight marginal vesicles, each with 4 to 6 otoliths. 
The basal bulbs of the tentacles and the bulbs without tentacles 
are alike in coloration. There is a yellowish centre nearly sur- 
rounded by a deep purplish band, which does not meet on the 
inner side of the bulb. 
A specimen was taken 15 mm. in width and 11 mm. in length. 
Apparently all the large watch-glass shaped meduse are in their 
earliest stages bell-shaped, the umbrella being about as long as 
wide. The umbrella gradually grows broader; the tentacles at 
the same time increase in number. 
A specimen was taken on April 23rd, at Valencia, with the 
umbrella 20 mm. in diameter and shaped like a deep watch-glass. 
The stomach short, and mouth with four fimbriated lips. On the 
margin of the umbrella 28 large tentacles, and between every pair 
a large bulb, the commencement of another large tentacle. 
