x¢cll PROCEEDINGS. 
CaLcarREous ALG. 
(Reduced to nearly one-fifth of actual diameter ). 
Dr. A. H. MacKay presented specimens of calcareous alge for 
general examination, such as the incrustations shown on the stones at 1, 
2, 3, 4, and 6 (above), which came from low water at Cranberry Head, 
near Yarmouth. Tufts of Corallina officinalis, L. were growing con- 
spicuously from some parts of these ; 5, 7, 8,9 and 11 were more or 
less tuberculose or branching incrustations of Lithothamnion on stones 
as a base, while 10 and 12 were incrusting mussel shells. His discussion 
of the group was preliminary to further work, and the exhibition of the 
specimens was to enlist the fellowship of additional collectors of these 
species. The Corallinee, or calcareous alge, which he was showing, 
came principally from Point Pleasant, within and opposite the mouth 
of Halifax harbor, although he had specimens all the way from Brier 
Island to Cape Breton. The Corallinece belonged to the Floridec, or 
red sea-weeds. 
The genus Corallina grows in feather-like tufts composed of short 
articulations when examined closely. When growing, these fronds are 
of a darkish or light red eolor like that of the du/se and other red alge. 
