No. 608] SHORTER ARTICLES AND DISCUSSION 497 



was restored to the jar. Artemia is resistant to concentration, 

 but not to the same degree as Ephydra larvffi. Again, in an at- 

 tempt to kill larvffi without distortion some were placed in 

 Perenyi's fluid and in this were capable of movement after more 

 than twenty-four hours. In Flemming's fluid they live several 

 times as long as Artemm, but I have no record of the exact length 

 of time. I am able to verify with certainty Aldrich's belief 

 that these larvae do not rise to the surface for air. 



Most important of the incomplete observations were those indi- 

 cating the presence of Protozoa as normal inhabitants of Great 

 Salt Lake. So far as I am aware, no Protozoa have been previ- 

 ously reported from brine lakes. Representatives of this group, 

 notably Amoeha, were first seen in the moderate dilutions after 

 some weeks in the laboratory, which proved to be in a sense cul- 

 tures. In March, 1910, several jars of a series, including one of 

 undiluted lake water, contained an abundance of these forms. 

 The specimens were of two or three varieties or species, by far 

 the most common being very like Amoeba Umax. I should not 

 have hesitated to call it that in a fresh-water culture. A class 

 of some 15 students was well supplied with AmoeboB for 'labora- 

 tory work from one of these jars. Occasionally, in making micro- 

 scopic examinations of the cultures other Protozoa were met 

 with, but never in numbers. In fact only a single specimen at a 

 time was the rule. Specimens of Ciliata were seen, some closely 

 resembling a species of Urolfptus, while at least once a species 

 of Euglena was definitely noted. Chlamydomonas appeared 

 quite regularly and in great quantity in many of the cultures.* 

 I believe several species of Protozoa to be present normally in 

 the Great Salt Lake, but not generally very abundant, as many 

 of my efforts to secure them directly from the lake were failures. 

 However, some were certainly obtained directly from the more 

 or less decayed masses of organic debris \\'hicli collect in enor- 

 mous quantity in the great stretches of sliallow water along the 

 very flat shore, which masses consist mainly of the gehitinous 

 blue-green alga, Aphanothece pacJcardli.* (This is the alga "of 

 the Nostoc group" mentioned by Aldrich.) In this material it 

 was expected there might be found Nematodes, as they are in so 

 many cases adapted to unusual environment, and so commonly 

 present in decaying substance, but none ever came under obser- 



Perhaps a statement of the annual cycle of life of Artemia and 

 Ephydra may be of interest. For the latter it may be said that 



