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. FLUSTRA TRUNCATA, 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 F. chartacea, being, at times, fully 

 four inches in height and three in breadth; it is divided 

 into a greater number of segments than F. 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 



