HALECIUM. I Fn: 
1. Hatectum HALectnum,James Newton. (PlateIII. 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. Hatectum Beanu, Wiliam 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 1 saw of Scottish origin were sent to me by Lady Keith 
Murray, who found them at Stonehaven. I afterwards got 
