RHODOPHYCEAE 
Porphyra umbtlicalis 
Corallina officinalis 
Delesseria spp. 
Ceramium spp. 
Callithamnion spp. 
Polysiphonia spp. 
Gelidium corneum 
Furcellaria fastigiata 
Polyides votundus 
Ahnfeltia plicata 
Calliblepharis lanceolata 
Griffithsia spp. 
Phyllophora spp. 
The list quoted above will serve for the whole of the 
north side of the bay, but the character of the flora changes 
somewhat where the coast lifts into the steep cliffs of the 
Bradda (Map II, 2) promontory. In Spaldrick Bay 
(Map IT, 3) where fresh water comes down from the land, 
patches of Fucus ceranoides may be found. 
Immediately below the Biological Station the inlet 
sheltered by the old boat-landing should be studied, as 
its shore provides a sample of zoned vegetation. 
A very clear Fucoid series can be observed shewing in 
succession from high water mark downwards :—Pelvetia 
canaliculata, Fucus spiralis, Fucus vesiculosus, Ascophyllum 
nodosum on the boulders and Fucus serratus on the level 
rocks. Similarly on both sides of the boat-landing and 
on the broken breakwater itself at low water mark may 
be seen a Laminaria zone with L. digitata above, Saccorhiza 
polyschides in the lower part of the L. digitata zone and 
L. Cloustont below. 
In the inlet pool itself at very low spring tides may be 
found many of the rarer algae, particularly in the crevices 
between the concrete blocks. 
Port St. Mary. 
The limestone terraces (Plate 1) marked on the map as 
“the Ledges”’ (Map II, 9) offer an excellent opportunity 
