34 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
to avoid any omission or duplication. At lee I counted 
2,940 in one square foot, varying in size from 7% in. to 2 in. 
across the base. The only part of the area - — by 
barnacles was where two small limpets had established them- 
selves. The rocks below the old Biological Station support 
another variety, for though they entirely covered the rock 
they appeared more distinct from one another, being higher 
in proportion from base to crown than those at Fleshwick. 
Here I found rae . ,138 to the square foot, the : ae size 
(long axis) being 2 
‘« Lower down re shore, about half-tide, Fucus begins to 
crowd out the Barnacles. It grows in great masses chiefly on 
the tops of rocks, to a length of about 18 ins., and on its fronds 
shelter large numbers of Lnttormna, Purpura, and Srorbis ; 
the last-named I did not attempt to count, and it was difficult 
_ to obtain reliable statistics concerning the first two, as they 
fell off and were lost at the shghtest disturbance. On the 
North side of Spaldrick Bay and in Trai Veg epiphytic 
Polysiphoma is abundant on the Fucus. My method with 
Fucus was to shave the rock and count the stalks of weed. 
When all the weed is cut away the rock is found to be by no 
means bare, for in one typical observation I noted, beside 
35 stalks of Fucus serratus, 324 Balanus, 13 Actinia, 1 Patella 
and 206 Syirorbis in the square foot. Fucus vesiculosus grows 
more abundantly still, 352 stalks arisimg from 12 ‘ roots’ in 
one square foot. 
“ Although limpets are found quite commonly amongst 
the barnacles and the Fucus, they thrive best where they are 
entirely free of neighbours, on vertical faces of rock, and near 
low water mark. These three conditions are best fulfilled on. 
the shore side of Trai Veg, where I found as many as 37 in 
one square foot, five of which were over | in. across, and in 
other observations, though there was a smaller number, a 
much larger proportion were between | in. and 2 in. In this 
