HALECIUM. 121 



1. HALECIUM HALfcciNTJjf,/<m^ Newton. (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 wrinkles ; vesicles on the 

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

 side a little produced on the summit." (Dr. 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. HALECIUM BEANII, William Bean. (Plate III. fig. 8.) 

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



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

 Ilassall, 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 



