THE SHORES OF BRITAIN. 39 
by the mighty force of the tide which has been 
driven in, jn thunder, by the power of a fierce 
tempest, as when the waves have rolled gently and 
calmly to the shore in their sweetest murmurs, 
These insects have never been seen to swim, in- 
variably walking among the branches or leaves of 
the conferve or fuct, amongst which they delight 
to dwell; and when shook out from their hiding- 
places into a bottle or tumbler of water, they may 
be seen to fall in gyrations to the bottom, without 
ever attempting to dart through the watery element, 
as in the case with the Cyprides. Upon reaching 
the bottom they open their shells, and creep along 
the surface of the glass; but when touched or 
shaken, they immediately again withdraw themselves 
within their shell, and remain motionless."* The 
Cyprides, here alluded to in comparison, are species 
very closely resembling these, inhabiting abundantly 
every stagnant ditch and pool of fresh water. They 
have their antennz and feet beautifully feathered 
with long fringed bristles, by aid of which they 
swim with much vivacity. In exactly similar situ- 
ations to those above described are found other 
Entomostraca, marine species of the genus Cyclops, 
almost equally minute, and equally interesting. 
Like their kindred of the same genus found in fresh 
waters, and which are so numerous in the water 
conveyed into London that we swallow them daily, 
these swim with ease, progressing by sudden bounds 
made with great vigour and effect. Mr. Baird no- 
tices of one marine species (C. depresses), which he 
* Mag. Zool. and Bot. ii. 141. 
