BRANCHIOPODA. 223 



markable character of all these pretty little " water- 

 fleas " that they seem to have but a single eye, 

 which is generally of a bright crimson hue, spark- 

 ling like a little ruby, and set in the front of the 

 head. 



FIG. 170. WATER-FLEAS. 1. Cyclops communis ; 2. Cypris unifasciata ; 3. Daplmia 



Some of these Entomostraca^ as they are called 

 (that is, insects with shells), inhabit the sea, and may 

 be met with in abundance in clear pools worn in the 



FIG. lYl.- MARINE EXTOMOSTRACA (Cythere albo-maculata and Cyclops chelifer). 



rocks, sporting about amongst the confervse and 

 corallines that often so fancifully fringe their edges 

 and decorate their sides, forming a miniature sub- 

 aqueous forest, for myriads of living creatures to 



