144 MISS MARION I. NEWBIGIN. 
are only a few of the animals which seek food and safety 
by burrowing in sand. 
Then there are many other shore animals which do not 
actually burrow and are not fixed, but which, when the tide 
ebbs, creep into dark and shady corners, among weeds and 
stones, in search of moisture and safety from keen-eyed foes. 
It is in search of these that the shore-hunter diligently 
turns stones and creeps under overhanging rocks, where the 
weeds drip and the sea-squirts eject their tiny jets of water. 
Before we leave these interesting forms one other point 
must be touched on. We have seen that they are 
characterised generally by their sedentary habits, are 
often fixed, and can rarely travel any considerable distance. 
But we have already seen that when any change of current 
uncovers a stretch of rocks hitherto covered, that these 
rocks speedily become colonised with the common forms. 
How do these reach the new area? Let us take a concrete 
example. In many parts of the Clyde the piers are 
densely covered with sedentary animals, which clothe the 
supports almost throughout their whole leneth. If one 
goes out in a boat at a low tide and rows in among the 
wooden supports of Keppel pier, Millport, for example, 
the spectacle which discloses itself is one not soon to be 
forgotten. Each pile is clothed from low-water mark to 
base with a forest of giant sea anemones, animated flowers 
with their myriad tentacles swaying gently in the current, 
their colours of snowy-white, brilliant orange and pale 
yellow thrown up by the background of crimson weed 
and delicately tinted zoophytes, while in and out of that 
fairy forest the silver-sided fish dart, suddenly disappearing 
as the shadow of the boat falls over their dim water world, 
and then as suddenly reappearing. It is one of those 
sights which repay the shore naturalist for many a wetting 
and many a fruitless hunt. The special point of interest 
at present, however, is the question how the anemones 
got there. The pier is very modern, and the anemones 
are at least rare at other parts of the shore. The answer 
explains the distribution of shore forms generally. Almost 
all such sedentary forms produce active free-swimming | 
Jarve, which are usually minute, and which are swept by 
