1904 - 5 .] Report on Medusae found in Firth of Clyde. 763 
Many fine adults were collected by Messrs Jenkinson and Montagu, 
and examined by me. 
It was first found in Lamlash Bay by David Landsborough 
(1847). 
Forbes found this species abundant in the Kyles of Bute during 
July 1839. 
I expected to find the earliest stage of the medusa in the Clyde 
during 1902, but my expectations w r ere not realised. 
Description of the smallest specimen : — The umbrella measures 
2 m 5 mm. in length and width. The gonads are just beginning to 
appear, and they extend over the proximal half of the radial canals. 
There are about twenty large tentacles. The tentacles opposite 
the eight radial canals are slightly larger than the others, indicating 
that the medusa probably begins its free-swimming life with only 
eight tentacles. There is a minute tentacle between every two 
large tentacles. 
Description of an intermediate stage : — Umbrella about 3‘5 mm. 
in length and 4 mm. in width. The gonads extend over the 
central third of the radial canals, forming two narrow bands along 
each side of every canal. About forty large tentacles and forty 
minute tentacles, alternating with one another. 
Description of the adult : — Umbrella somewhat cone-shaped, with 
a thick mass of jelly above the stomach. Yelum narrow. The 
stomach is octagonal, as broad as the top of the cavity of the 
umbrella (it is occasionally on a short broad peduncle), but only 
extending down about one-quarter the length of the cavity of the 
umbrella. The margin of the mouth has eight lips and some small 
folds. Eight radial canals, which are large and project outwards 
from the wall of the sub-umbrella. The gonads extend over the 
outer two-thirds of the radial canals, reaching down to the velum, 
and are sinuous. About sixty-four large tentacles, with laterally 
compressed basal bulbs, and sixty-four small colourless tentacles, 
which alternate with the large ones. 
Colour.- — Yellowish-brown or yellowish gonads, stomach, and 
basal bulbs of the large tentacles. 
Size. — Umbrella 11 mm. in length and width. 
The largest specimen collected by Jenkinson and Montagu in 
Lamlash Bay was 13 mm. in length and 10 mm. in width. 
