248 Zoology of Colorado 



species of Difflugia, remarkable for hav- 

 ing the plasma of a beautiful red color. 

 He named it D. rubescens. But return- 

 ing to Switzerland, he found the very 

 same kind of animal in that country. 

 '* ** Dr. Sturgis in 1913 described a new 



Shelled Protozoa • . , 1 •-. » . r 1 



I. Difflugia rubescen, Penard. slime-mold as FullgO mCgaSpOTQ, found 



Aft?rPentd f th P m e a n g a n?„ed. on Cheyenne Mountain, near Colorado 



Springs. The same thing was also found 

 at Lake Albert Edward, in Central Africa. Microcorycia flava of 

 Greeff , well-known in Europe and North America, living among 

 mosses, is reported by Wailes from Brazil and Bolivia. In 191 1 

 Dr. C. H. Edmondson collected Protozoa in the alpine lakes of 

 Boulder, Grand, Gilpin and Clear Creek Counties, but although 

 such lakes have furnished many peculiar mollusca, the Protozoa 

 were like those found at lower altitudes and on the other side of 

 the world. Some of the species were not identified, and it is 

 possible, though not probable, that these may be in part peculiar 

 to our mountains. A collection was made at 13,000 feet on Mt. 

 Evans, and this is believed to be the highest recorded locality for 

 Protozoa in North America.* 



It results from the condition of affairs described that the 

 determination of freshwater Protozoa is not always easy, since 

 the species before us may have been described from almost any- 

 where on the earth, and it is necessary to consult the literature 

 of the subject published in all the countries, and in many languages. 

 In the majority of cases identification must be made from figures 

 and descriptions of specimens which were not preserved, and if 

 these were not sufficiently full and accurate, we are left in doubt. 

 Nevertheless, with the aid of numerous modern works, such as 

 those of Penard, Wailes, Edmondson and Conn, it is possible to 

 make good progress, and the opportunities for such studies in 

 Colorado are very great. 



The Phylum Protozoa is usually divided into subphyla, dis- 

 tinguished by the modes of locomotion and reproduction. In 

 the Mastigophora or Flagellars , locomotion is by a thread-like 

 movable extension of the body called the flagellum. Not rarely 

 there is more than one of these flagella. In the Sarcodina there 



*University of Colorado Studies, vol. IX, May 1912. 



