II 
from just beyond the cottage on the Castletown side of the 
point where the main road leaves the coast, leads directly 
seawards. It provides an easier means of access to the 
lower levels of the littoral zone than is afforded by a 
scramble over a considerable stretch of large boulders 
covered with Ascophyllum. On the right of the cart track 
as one faces the sea are a series of rock pools with a varied 
and interesting flora. In the summer time this is an 
excellent hunting ground for the rarer Rhodophyceae, such 
as Monospora pedicellata, Griffithsia corallinoides, Spondy- 
lothammon multifidum, Antithamnion cruciatum, etc. In 
many of the deeper pools Halidrys siliquosa is well 
established as a perennial and yields a number of 
interesting epiphytes of restricted distribution. Tzlopteris 
Mertens and Stictyostphon tortilis have been recorded for 
this locality alone and have not as yet been found in any 
other part of the survey area. An opportunity of collect- 
ing at the lowest of spring tides, especially in calm weather, 
or better still with a gentle off-shore breeze, could be 
employed more profitably in an examination of the low- 
lying levels of the shore at Pooyllvaaish than in any other 
part of the district. 
CASTLETOWN. 
The Castletown beach provides a type of shore in some 
respects similar to that of Pooyllvaaish. It is an 
excellent area for general collection in the springtime. The 
coast enjoys a certain amount of shelter and it has been 
noticed repeatedly that many of the Rhodophycee reach 
greater size and are of more luxuriant habit in the large 
shallow pools in the Fucus-covered littoral zone at Castle- 
town than elsewhere. South-eastward towards Scarlet 
Point (Map II, 13) the land rises into terraces of limestone 
carrying an algal flora similar to that already described 
gor Port St. Mary. 
