348 HISTORY OF BRITISH ZOOPHYTES. 
colour, though occasionally tinted with pink. It is scarcely 
two inches in height; and it is thin and glistening. 
3. FLrustra tTRuNcATA, Narrow-leaved Horn-wrack. 
(Plate XVII. fig. 64.) 
Hab. Very common on many of the shores of Scotland, 
as well as the north of England, but not found in the 
south of England. It is common in Belfast Bay. Mr, W. 
Thompson, Peterhead; abundant and very fine, Mr. Peach. 
It is found in great abundance betwixt Leith and Porto- 
bello. The finest specimens I have seen were gathered by me 
at the Black Rocks, Leith, at low-water, glistening, when 
dried, as if varnished. We have found it also at Dirleton, 
opposite to the Bass Rock. But we have never fallen in 
with it on the coast of Ayrshire, Arran, or Cumbraes. 
This differs considerably from both the preceding species. 
It is much larger than /. chartacea, being, at times, fully 
four inches in height and three in breadth; it is divided 
into a greater number of segments than /. foliacea, and 
they are narrower and truncated. Leaflets often spring 
from the edges of the segments. The cells are linear-ob- 
long, and have often a black dot in the centre, which is 
probably the remains of the dead polype. In the specimens 
gathered by me at the Black Rocks, Leith, the younger 
