OF THE FIRTH OF FORTH. 55 
5 fathoms ; and have collected it between 
tide marks at several points on both 
shores of the Firth. 
Pelonaia corrugata (Forb. and Goods.). 
This species was dredged by Professor 
Goodsir in deep water off Anstruther, and 
was described first in Jameson’s Ldinburgh 
New Philosophical Jowrnal for 1841 (vol. 
xxxL, p. 29). The only occasion, so far as 
we are aware, on which it has since been 
taken in the Firth of Forth was in 1872, 
when it was dredged by the German 
North Sea Expedition in 24 fathoms, off 
the Bass Rock.* Dr M‘Intosh informs 
us that he has obtained this species 
several times at St Andrews. It has 
also been found in Berwick Bay and 
down the Northumberland coast. 
ASCIDIIDA. 
Ascidia virginea (O. F. Miller). 
This species, which is synonymous with 
Ascidia sordida (Ald. and Han.), is very 
common in a few fathoms of water and 
upwards in all parts of the Firth. 
On the oyster banks it occurs in profu- 
sion adhering to dead shells, Algze, Zoo- 
phytes, etc. The specimens are of large 
size, and often united in clumps. We 
have also dredged it plentifully in other 
parts of the Firth, viz., north-east of Inch- 
keith, 12 fathoms; Aberlady Bay, 9 
fathoms ; off the Isle of May, 8 fathoms ; 
and off Fidra, 7 fathoms. 
Young specimens of this species are often 
obtained adhering in clusters to masses of 
Gemellaria loricata, and in this condition 
are frequently found on the beach after 
* Kupfler—Jahresb., VII. Tunicata, p. 227. 
