BPtAXCHlOPODA, 225 



Tlie Cytliereas (Cythere), 'Fig. 171;, are marine ; tliey live among 

 tlie fuei and ooiifervse found in little pools among the shingle on the 

 sea-sliore, and the naturalist may specially find them in abundance 

 in those beautiful clear little round wells, hollowed out of the rocks 

 wliich are within reach of the renovating influence of the tide. In 

 such delightful pools, slieltered among the "umbrageous multitudes" 

 of stems and branches, and nestUng in security, wealc and powerless 

 a-s such pigmies seem to be, they are found as numerous and active 

 after the shores have been desolated by the power of a fierce tempest, 

 as when the waves have rolled gently and calmly to the shore with 

 their sweetest murmurs. 



The Cyprides (Ciji/ris), (Fig. 170, 2) have only six legs, and their 

 two antennae are fm-mshe<l with a tuft of hair apiece ; then- body is 

 enclosed in an oval shell compressed at the sides. These little 

 creatur&s swim with considerable rapidity, apparently by means of 

 their 'antennse ; they are likewise able to crawl with their little hooked 

 feet upon the surface of the submerged plants. The female lays her 

 eggs in masses upon the stems of vegetables or on the mud, some- 

 times as many as eighty at a birth, and, strange to say, the females 

 hatched from these eggs, although kept quite apart, are equally 

 prolific with the rest. 



Tlie Daphnise ( Daphnlai), (Fig. 170, 3) are likewise enclosed in a 

 shelly covering, and swim actively l»y means of their tufted antennae. 

 Their fecundity is prodigious; and the female will lay many suc- 

 cessive generations of eggs in the course of the summer, all of which 

 give bhth to equally fertile females. It has been calculated tliat the 

 progeny of a single indi\idual may amount even during her lifetime 

 to four billions and a hah', the aggregate of which would weigh 

 nearly eight tons. 



The second section of the Branchiopod Entomos- 



tracans, that of 



The Phyllopeds (Fliyllopa), includes those genera whose legs, at 

 least twenty in nimiber, are composed of flattened and leaf-like laminae. 

 Their eyes are always two in number, and sometimes pedunculated. 



Fig. 172 — faiey shrimp. 



To this section belong 



The Fairy Shrimps (Chirocephalus diaphanus), (Fig. 172), occasion- 

 ally met with in ponds. These pretty creatures, which are as trans- 



L 3 



