266 
HISTORY OP BRITISH CRUSTACEA. 
enjoyment ; whilst in what are called the sun-pans, where 
the brine is made by the admission of sea- water during the 
summer, and which are emptied every fortnight, they are 
never found at all. During the fine days in summer they 
may be observed in immense numbers near the surface 
of the water, and as they are frequently of a lively red 
colour, the w r ater appears to be tinged with the same hue. 
f There is nothing more elegant/ says Mr. Joly, f than the 
form of this little Crustacean ; nothing more graceful than 
its movements. It swims almost always on its back, and 
by means of its fins and tail it runs in all directions through 
the element it inhabits. It may be seen to mount, descend, 
turn over, spring forward, curve its body into the form of 
an arch and then rebound, and deliver itself up to a thousand 
bizarre and capricious gambols. Their feet are in constant 
motion, and their undulations have a softness difficult to 
describe/ The tanks or reservoirs are called clearers, as 
the liquor becomes clear w T hile in them, and this effect is 
attributed by the workmen to this constant and rapid 
motion of their feet. g So strongly persuaded/ says Mr. 
Eackett, f are the workmen of this fact, that they are 
accustomed to transport a few of the worms from another 
saltern, if they do not appear at their own / 99 * 
# Baird, Brit. Entomostraca, p. 58. 
