xcn 



PROCEEDINGS. 



CALCAREOUS ALG.E. 



(Reduced to nearly one-jifth of actual diameter). 



DR. A. H. MACKAY presented specimens of calcareous algae 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 Corallinece, or calcareous algae, 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 Floridece, 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 color like that of the dulse and other red algae. 



