T7 o XIPHOSURL 



The female lays her numerous eggs upon the stems of vegetables or on the 

 mud, sometimes as many as eighty at a birth ; and, strange to say, the females 

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

 prolific with the rest. 



The Daphnise (Daplmice) (Fig. 170,3) are likewise enclosed in a shelly 

 covering, and swim actively by means of their tufted antennae. Their fecun- 

 dity is prodigious, as the female will lay many successive generations of eggs 

 in the course of the summer, all of which give birth to equally fertile females. 

 It has been calculated that the progeny of a single individual may amount even 

 during her lifetime to four billions and a half, the aggregate of which would 

 weigh nearly eight tons. 



The second section of Branchiopod Entomostracans, that of 



The Phyllopeds (Phyllopd}, includes those genera whose legs, at least 

 twenty in number, are composed of flattened and leaf-like lamina:. Their 

 eyes are always two in number, and sometimes pedunculated. 



To this section belong 



The Fairy Shrimps {Chirocepkalus diaphanns] (Fig. 172), occasionally met with 

 in ponds. These pretty creatures, which are as transparent as i^lass, swim or rather 



FIG. 172. FAIRY SIIRIMT. 



glide through the water with their backs downwards, whilst the undulating play of their 

 numerous legs causes currents that bring nutritive particles towards their mouth in a 

 continuous stream. 



The Salt-water Shrimps (Artemia salina) are met with in the salt-pans at 

 Lymington, where they live in a brine sufficiently strong to pickle a round of beef. 



SWORD-TAILED CRUSTACEANS. ORDER XIPHOSURL* 



This Order contains but a single genus, namely, 

 The King Crabs (Limulus), a most extraordinary race of 

 creatures, commonly met with on the shores of tropical climates 

 both of the old and new world. In these animals the tail is con- 

 solidated into a single piece, forming a long, pointed, and ex- 



* i'0os, xiphos, a sti'ord ; ovpa, oura, a tail. 



