7 84 Proceedings of Royal Society of Edinburgh. [sess. 
and Valencia. It has also been recorded from St Andrews and 
the Isle of Man. 
Ctenophor^. 
Pleurobrachia pileus (Fabricius). 
Pleurobrachia pileus, Chun, 1898, p. 15. 
Pleurobrachia pileus, Vanhoffen, 1903, xi. p. 3, figs. 4-6. 
In 1901, Pleurobrachia was taken on 5th June. The largest 
specimen measured 12 mm. in length. During June and July it 
was very scarce. On 17th September young stages up to 5 mm. in 
length were taken, and up to the middle of October Pleurobrachia 
was always present off the Cumbraes, and often fairly common. 
The specimens taken did not exceed 10 mm. in length. 
On 21st October there was a sudden increase in quantity. A 
small shoal appeared, containing both very early stages and adults 
(up to 15 mm.). The shoal rapidly diminished, and Pleurobrachia 
became scarce towards the end of the month. Tow-nettings taken 
during the third week in November did not show the presence of 
any specimens. 
On 2 1st September young and intermediate stages were fairly 
common in the Kyles of Bute. 
In 1902, Pleurobrachia was seldom seen. It was first taken on 
20th May. During June and July a few specimens (5-10 mm. 
in length) were obtained. It was absent during August and the 
first half of September. Towards the end of September young 
stages (3-4 mm.), and during October early and intermediate 
stages (2-6 mm.) were taken. It was only once seen in November 
(on the 16th), and not at all in December. 
From the middle of July to the end of the year only sixteen 
specimens were taken in the tow-nets, so that Pleurobrachia was 
much scarcer in 1902 than in 1901. 
There are apparently two generations in the year ; one during 
the spring and another during the autumn. 
Bolina infundibulum (Fabricius). 
Mnemia norvegica , Sars, 1835. 
Bolina hibernica, Patterson, 1838. 
