HALECIUM. 121 



1. Hai^ecivm uaJjECH^vm, James A^ewtoti. (Plate III. fig. 7.) 

 Hab. On old shells and stones in deep water; generally 



common. Firth of Forth, D. L., jun. ; Bootle Bay, Mr. 

 Tudor. 



Polypidom from four to ten inches high, attached to 

 shells, etc., by numerous matted fibres ; the stem and prin- 

 cipal branches composite ; " base of numerous tubes, which, 

 by uniting, form those larger parallel tubes of which the 

 stem consists ; the smaller branches are simple, and diverge 

 at a regular angle, each supporting a few alternate tubular 

 cells, with one or two transverse WTinkles ; vesicles on the 

 sides of the branches, irregularly oval, with a tube on one 

 side a little produced on the summit. ''^ {3/-. Fleming.) — As 

 all the branches stand at an acute angle with the stem, this 

 gives it an appearance which has procured for it the name 

 of the Herring-bone Coralline. Though common on many 

 shores, it is rather rare on the Ayrshire coast. 



2. ^k\:^q\v>^)l^y.k^\\, William Bean. (Plate III. fig. 8.) 

 Hab. Near Scarborough, in deep water, rare, Mr. Bean ; 



Belfast Bay, Mr. W. Thompson and Mr. Hyndman ; Mr. 

 IlassaU, Dublin Bay; Professor Harvey, Dublin Bay. The 

 first I saw of Scottish origin were sent to me by Lady Keith 

 Murray, who found them at Stonehaven. I afterwards got 



