1900] MICROSCOPICAL JOURNAL. 221 



cent. The structure will take some of the analine stains 

 quite readily ; it may then be carried through absolute 

 alcohol with phenol, then through phenol and turpentine, 

 and be permanently mounted in balsam. 



In point of zoological classification it may be said that 

 the brine shrimp is a crustacean, and is generally refer- 

 ed to the order Phyllopoda one of the divisions of the sub- 

 class Entomostraca. In all phyllopods except those of 

 the highest family of the order, a carapax covers the 

 greater part of the body. To this highest family — the 

 Branchipodidce the artemia belongs. 



The Artemia is distinguished from a nearly allied form, 

 the Branchinecta in the following particulars : Artemia 

 possesses eight abdominal segments ; the second pair of 

 antennae or claspers, which are highly developed in the 

 male, and flat and of triangular shape inthe second joint; 

 the ovisac of the female is short. Branchinecta has nine 

 segments composing the abdomen ; the claspers are sim- 

 ple and cylindrical ; the ovisac is long and slender. 



Commenting on the structural and other relations be- 

 tween these two forms, Prof. J. 8. Kingsley says ; "Un- 

 der ordinary circumstanceg these [differences] would be 

 considered as of generic value : but what shall we say 

 when we know the results of the observations and expe- 

 riments of the Russian naturalist, Vladimir Schwanke- 

 witsch ? Condensed from his account these were as fol- 

 lows : In 1871 the spring flood broke down the barriers 

 separating the two different lakes of the salt-works near 

 Odessa, diluting the water in the lower portion to 8 de- 

 grees Baume, and also introducing into it a large number 

 of the brine shrimp, Artemia salina. After the restora- 

 tion of the embankment the water rapidly increased in 

 density, until in September 1874, it reached 25 degrees of 

 Baume's scale and began to deposit salt. With this in- 

 crease in density a gradual change was noticed in the 

 characters of the artemia? until late in the summer of 1874, 



