594 Transactions. 
Corallina are not so obvious. The deposit of carbonate of lime may be: 
of some use in this respect, but of this there appears to be no evidence. 
Corallina associations appear to be found in all seas. They have been - 
described from such widely-sundered localities as Ireland (Cotton, p. 39), 
New South Wales (Hedley, p. 58), and Hawaii (MacCaughey). Porphyra 
Hormosira Banksii is extensively developed at Long Reef, New South 
Wales, and differs from similar associations in New Zealand only in the 
associated species of animals. 
Coralline-algae Subformation. 
The association in which Corallina is dominant is found throughout 
New Zealand on exposed coasts above the large-brown-algae formation, 
and in rock-pools between tide-marks. It forms a low growth of little 
tions. The most common association of algae in the mid-tide belt in New 
Zealand is that of Corallina and Hormosira. Corallina appears to require 
developed in harbours. Both plants are tolerant of a certain admixture 
of fresh water, and of mud with the sea-water. Associated with these 
algae are always a number of shelled animals—molluscs, worms, sessile 
barnacles. 
Corallina Association. 
Tauranga. — Immediately above the brown-algae formation on kr 
North Rocks, Mount Maunganui, there is a belt more or less covered ker 
Corallina officinalis and other small algae. There is also a good deal : 
inius modestus, and in crevices Vermilia carinifera. On the rocks ies 
many molluses—Cellana radians, Sypharochiton ‘pellisserpentis, Lepsie 
poe { also the starfish Patiriella regularis. 
uc 
es 
Turbo smaragdus and Cerithidea Subcarinata are abundant. Small exam 
of Amaurochiton glaucus occur on the shells of Turbo, whilst Dardan" 
olivacea swarm among the Corallina. ! | 
Corallina-Hormosira Association. 
| à; ith 
Takapuna.—Here are extensive areas of voleanie rocks сочена a 
a Corallina-Hormosira association fairly uniform in composition. с 
occurs as a fringe round the edge, and on rough surfaces Hormosira is foun 
