118 CRUSTACEA. 



the tail is terminated by two short filaments. Subsequently the 

 legs begin to appear by degrees, and the branched organs entirely 

 disappear. 



The genus Artemia (Leach) comprises the Cancer salinus 

 of Racket (Linn. Trans, v. ii.) or the brine shrimp. J. V. 



Brine Shrimp, In various stages of growth. 



Thompson and V. Andouin have both published interest in-; 

 notices of it. The body is oval, and flattened, with the head 

 not separated from it ; the tail or abdomen is long, termi- 

 nated by two small points. " The brine shrimp, or Artemiu " 

 (not Artemis, as Mr. Thompson, from whom I quote tin- 

 following observations, calls it) " salinus, is a very small and 

 delicate animal ; when full grown about half an inch in length, 

 of considerable transparency, slightly tinged with yellow, 

 and with a highly polished surface : nature having constructed 

 them with members solely adapted to swimming. the\ >e-'in 

 to be in perpetual pursuit of prey, gliding with an almost 

 even motion through the water, and moving with equal indif- 

 ference and facility on the back, belly, or sides : the shape 

 of the animal, the undulating movement of its fins, and the 

 glossy appearance of its coat render it an object of a very- 

 interesting description, more especially \\heu apprised, that 

 analogous animals appear to have been the first created con- 

 spicuous inhabitants of the primitive fluid, of which these 



