ENTOMOSTRACA. 



433 



ton, where it is usually found in those pans in which the 

 evaporation of the water has proceeded to a considerable 

 extent. 



Daphnia pulex is found 

 commonly in fresh water, 

 arid is scarcely inferior to its 

 marine relative, Talitrus lo- 

 custa, in agility. The Coro- 

 phium longicorne, remarkable 

 for its long antennse, is not less 

 so for its singular habits. It 

 is found at Rochelle, where it 

 burrows in the sand, and 

 wages constant war with all 

 other marine creatures of mo- 

 derate size that come in its 

 way. 



A few years since, only a 

 small number of the Ento- 

 mostraca were described. Dr. 

 Baird has lately contributed a 

 valuable volume on the British 

 species ; published by the Ray 

 Society, 1850. 



In theMaiada, " Sea-spiders," the carapace is more or less 

 narrowed in front, forming a projecting beak or rostrum ; 

 the legs are long and hairy ; the back covered with spines 

 and hairs, much resembling the Spider tribe, whence 

 the name of Spider-crabs or Sea-spiders, by which these 

 animals are known. 



COLLECTING SALT-WATER SPECIMENS. "Nothing," says 

 Dr. Harvey, " can exceed the beauty of a clear rock-pool, 

 seen under strong sunlight, and through a calm surface, 

 tenanted by its various animated tribes, all fulfilling the 

 duties allotted to their several kinds. Careful examination 

 with a lens will generally detect a multitude of minute 

 shells, some of very strange shapes, and others possessing 

 structures of great elegance. These are the various species 

 of Foraminifera. We should recommend these species to 

 be studied in a living condition, whenever opportunity 

 presents, as it will prove a study of great interest. The 



F F 



Fig. 215. 



1, Cypris. 2, Polyphemus, Cyclops. 

 3, Branchiopus stagnalis. 



