1904 - 5 .] The Pelagic Fauna of the Firth of Clyde t 789 
the latter half of the month. Fairly common during the first half 
of November, and then very scarce till the end of the year. 
Cyphonautes is the free-swimming larval stage of Membranipora 
pilosa. 
PHORONIDEA. 
Actinotrocha. 
In 1901, Actinotrocha was only seen between 13th and 22nd 
July. On 20th July twelve specimens were taken, and on the 
22nd it was fairly common. 
In 1902, only two specimens were seen — one on 13th June 
and the other on 11th July. 
TUNICATA. 
Fritillaria furcata, Moss. 
.Fritillaria borealis , Lohmann, 1896, 1901, iii. p. 13, figs. 14-15. 
In 1901, it was fairly common about the middle of July, and a 
few specimens were taken about the middle of August. It was 
not seen during April, May, or June. 
In 1902, from January till the end of April Fritillaria was 
taken in the nets. As a rule it was scarce, but was fairly common 
on 24th January and common on 19th March. It was more 
abundant from January till March than Oikopleura. Specimens 
with gonads were taken early in February and also about the 
middle of March. 
It was not seen during May, June, or July. 
On 4th August a few specimens were taken, and on 11th August 
it was fairly common, but no specimens were seen towards the 
end of the month. On 1st September it was common, but was 
not seen again until 4th October, when only one specimen was 
taken. Solitary specimens were taken on 22nd and 30th October, 
and 15th, 20tli, and 26th November. On 2nd December it was 
very scarce, but fairly common on the 9th. A few specimens 
were taken on the 23rd. 
Fritillaria appears to be more common than Oikopleura during 
the winter months. 
