258 H. L. SHANTZ. 



with slow labored movements, and this may have contributed to 

 the sudden disappearance of the phyllopods. 



This lake has no vertebrate fauna of any kind. The most 

 common species besides the one here considered is Diaptounts 

 sJwsJione Forbes (Ward, 1904 : 140) which is a very large form, 

 of a pure deep red color, and very abundant. Daphnia pitlex De 

 Geer (Ward, 1904 : 149) and DapJinia longispina Miiller are also 

 quite abundant. The bottom fauna is especially rich in insect 

 larvae and Turbellaria. The flora is entirely algal, chiefly Conju- 

 gatae, which are relatively abundant. The Schizophycese are well 

 represented ; Merismopedia glauca Naeg., Gomphosphcera aponica 

 Kuetz., Anacystis pulverens (Wood) Wolle, and a number of 

 Oscillatoria and other filamentous forms were recorded. 



The writer wishes to acknowledge his indebtedness to Dr. H. 

 B. Ward, who suggested a study of the lakes in the Pike's Peak 

 region and the comparison of B. coloradcnsis with B. Linda/ili, 

 who furnished the material of B. Lindahli collected by Professor 

 Nelson, and who has given invaluable assistance in the prepara- 

 tion of these notes. 



