OF NORTHUMBERLAND AND DURHAM. 207 
The smaller size more varied markings, and shorter and more 
rounded convolutions, distinguish this species from the last.— 
The wheel-like markings ally it to the B. rotifera of Milne-Ed- 
wards, but the colour never approaches to red, and the folds of 
B. rotifera appear more elongated than in ours. In this respect 
our species approaches more nearly to the arrangement of B. 
albicans. 
3. B. atpicans, I, Edw. 
Botrylloides albicans, Forb. and Hanl. Brit. Moll. i. 24, t. A, 
38 (Sh 
On the under side of stones between tide-marks, St. Mary’s 
Island.—A. H. 
4, B. ramunosa, Ald. and Hane. 
General envelope colourless, pellucid, with a few pale yellow 
spots on the margin. Systems of individuals winding, much in- 
volved ; and having a broad cream-coloured belt down the cen- 
tre, following the sinuations. Animals of an obscure brownish 
yellow, with the lower half pale opake yellow. 
On the under side of stones in pools between tide-marks at 
Cullercoats, rare.—A. H. 
This species, which is in patches of upwards of an inch and a 
quarter across, is at once distinguished from B. Leachit by the 
opake belt of cream-colour that passes along the centre of the 
various systems of animals. 
The above attempt to describe the Tunrcata of our coast, im- 
perfect as it is, may serve as a ground-work for future investiga- 
tions. Some other forms are known to us which we have 
not ventured to describe, though we have seen sufficient 
to convince us that many species yet remain to reward the la- 
bours of future enquirers. The compound species are extremely 
difficult to make out, both on account of their great similarity, 
and because the same species, and even the same individual, is 
very apt to vary under different circumstances. 
