INTRODUCTION 17 
A large number of marine animals whose true home is among 
the Bahamas, or West Indies, are drifted upon the southern coast 
of Long Island by the southerly winds of the summer months 
and become quite abundant along our shores in August. [rom 
November until April, however, the northerly and easterly winds 
prevail, and these drift down upon us a host of creatures whose 
home is in the cold arctic water. We see then that tropical and 
sub-tropical animals are found along our coast in summer and early 
autumn, while arctic creatures live there in winter and spring. 
There are. however, an even greater number of creatures which are 
permanent residents, and are to be found with us in some stages of 
their lives at all seasons of the year. 
Many marine animals or plants thrive only between tides, and 
must be exposed to the air for at least an hour or two every day. 
Such are the barnacles, some snails, and the great masses of olive- 
green seaweed with gas filled cavities in its stems called ucus. 
Others, such as the brown, salmon-pink, and white sea anemones 
(Metridium marginatum) and the common starfish (Astertas forbe- 
sii), delight in the shallow tide-pools but do not thrive if long ex- 
posed to the air. 
Great numbers of creatures live along the coast beyond the 
influence of the tides and find their homes among the eel-grass, 
under stones or mud, or roaming freely through the water. 
Others, such as the Portugese man-o-war (Physalia), the beau- 
tiful, purple floating snail (-Janthina), and a host of jellyfishes and 
crustaceans find themselves at home far out at sea and never come 
near land unless drifted along the coast by accident. Such are 
the creatures which even thousands of miles from land cause the 
ocean to glisten with brilliant flecks of phosphorescent light, if 
the water be agitated at night. 
But there are other creatures which spend their whole lives 
upon the bottom of the deep sea, and have been dredged from all 
depths down to four and one-half miles. Here they live in the ice- 
cold water of the depths, where the darkness is profound and where 
no current moves. Many of them have very large eyes, or are pro- 
vided with remarkably long or delicate “feelers,” and phosphores- 
cent areas upon their skins, and thus they find their way around 
in their cold, dark, changeless world. A considerable number of 
