LINCEUS—CYCLOPS. 
contrast with, the surrounding parts. They are encased in the 
shell by which they are protected. The beak, b , is pointed, and 
participates in the general convexity of the shell. Under it is 
placed a second beak-like projection, somewhat shorter, and 
having three coarse hairs at its extremity, which probably serve 
the purpose of palpi or feelers. Below this are placed the 
two antennse, c , each of which is terminated by similar but 
longer hairs. The false feet or branchise, which are four in 
number and ranged along the edge of the shell, are covered 
with hairs, and terminate like the antennae; by their action a 
rotatory motion is imparted to the animalcule, which is accele¬ 
rated by the action of the projecting part, d , against the water. 
This part is ciliated on its posterior edge, and armed at its 
extremity with strong claws. The ovaries, which appear at e, 
have a greenish-blue colour, and the form of a mulberry. The 
convolutions of the alimentary canal with the food contained in 
it are visible with the microscope from one extremity to the 
other. 
But the most remarkable organ is a small oval body placed 
behind the head and shown in the upper part of the figure. This 
body has a rapid motion of pulsation. 
5. These creatures feed upon animalcules, and in their turn 
become themselves the prey of aquatic larvae and coleoptera, such as 
the water-beetles. They are the especial food of the lurco, or 
glutton (the larva of the naid), a magnified view of which is shown 
in fig. 5, with several lincei, c, visible within it. The young ones are 
seen playing around the mother, and on the approach of an enemy 
they rush for protection under her cuirass, which she immediately 
closes upon them. 
6. The crustaceous animalcule represented in b, fig. 1, in its 
natural size, and in A, fig. 2, magnified, is the four-horned cyclops, 
or little water-fiy ; the cyclops quadricornis of Muller, the mon- 
oculus quadricornis of Linnaeus, and the pediculus aquaticus, or 
water-louse, of Baker. The figure was drawn by Dr. Goring, and 
described by Mr. Pritchard in the Microscopic Cabinet. 
This little animal is found at all seasons in water, but more 
especially in the months of July and August, when it may be 
easily taken by a net at the depth of about an inch below the 
surface. 
The body is covered with scales, which have a vertical and 
lateral motion. Their edges do not meet under the insect, but 
leave a space for the insertion of the organs of respiration, a. 
The beak is short and pointed, and is a mere prolongation of the 
first segment of the body. A little above it is inserted in the 
cuirass a single eye of a crimson colour, so dark as to approach 
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