180 DROPS OF WATER. 



occasional protrusion of a foot ; the eyes are black : 

 it feeds on animalcules, and pursues its prey 

 with great activity. The Cyclops quadricornis, 

 or water-flea, is larger than the Lyncius, and has 

 branching horns, or arms : it is very transparent, 

 and the lungs may be seen clearly in motion : it 

 has but one eye. In some species, of which 

 there are several abounding in stagnant pools, 

 the eggs are enclosed in a membrane, and at- 

 tached to the outside of the body. The Cypris 

 is another curious creature, often found in great 

 numbers : the body is enclosed in a kind of 

 horny bivalve shell, which is not transparent; 

 horns, or arms, are occasionally protruded from 

 an opening, by the action of which it moves 

 quickly. Their shells are found in myriads in 



