Algal Communities, Stanmore Bay, N. Z. — Chapman 
65 
Fig. 2. Diagram of zonation on flat rock (left) and bluffs (right) at Stanmore Bay. 
be found on the flat shelf of the beach as the 
shelf is usually covered by sand at the level 
at which it would occur. It is therefore re- 
stricted to the bluffs and to the large boulders 
in the small bay. The lower part of the zone 
is characterised by the presence of the two 
barnacles, Chamaesipho brunnea and C. 
columna, the latter being more abundant than 
the former. 
Where the rock is overhanging, so that 
there is more shade and presumably less evap- 
oration, one may find Rbizoclonium tortuo- 
sum , Enteromorpha salina , and W ittrockiella 
sp. 2 Here too may be found tufts of Caula- 
canthus spinellus and one or two outliers of 
Volsella, the mussel of the belt immediately 
below. 
Barnacle Formation 
2. Chamaesipho- V olsella-(Apophloea) 
association 
In this area the dominants are Chamae- 
sipho columna and Volsella neozelanicus but 
in other places it is evident that the red alga., 
2 This is a new species of an interesting genus. 
A description will be published separately. 
