NOTES ON PROTOZOA 



By T. D. A. Cockerell 



In my paper on "Boulder Protozoa" in these Studies (Vol. IV, 

 No. 4, pp. 261-64, I 9°7)> I most unfortunately overlooked Dr. E. 

 Penard's very important paper in the American Naturalist, December, 

 1891, pp. 1070-83, entitled "Rocky Mountain Rhizopods." In this 

 paper are listed from the mountains of Boulder County 35 species and 

 two varieties of Rhizopods, and also two Cilioflagellata and three 

 Heliozoa. One species {Diffugia rubescens) is described as new. The 

 following species are to be added to the fauna of Boulder County: 



Acanthocystis myriospina Penard ? — near Caribou (Penard). 



Actinophrys sol Ehr. — near Caribou (Penard); University campus, 1908, very abundant 



(Cockerell; det. Edmondson). 

 Amiba Umax Dujardin — near Caribou, 10,000-10,500 ft. (Penard). 

 A. verrucosa Ehr. — near Caribou (Penard). 

 A. sp. (nov. ?) — Bald Mtn., about 12,000 ft. (11,470 according to Rydberg's Flora) — 



(Penard). 

 A. radiosa Ehr. — Fawcett's Greenhouse, Boulder, 1908 (Cockerell; det. Edmondson). 



[From the discussion recently published by Dr. E. L. Walker, it appears doubtful 

 whether the names Amiba and Chaos really apply to these animals. The name Oura- 

 moeba Leidy, based on a parasitized state of Amiba auctt. (Penard, Rev. Suisse Zool., 

 XIII, p. 585), appears to be available under the rules.] 



Anisonema acinus Duj. — Fawcett's Greenhouse, Boulder, 1908 (Cockerell; det. Edmond- 

 son). 



Anthophysa vegetans Mull. — Boulder, 1907 (William Winner; det. Cockerell). 



Arcella vulgaris var. angulosa Leidy — near Caribou (Penard). 



A. discoides Ehr. — near Caribou (Penard). 



A. microstoma Penard — near Caribou (Penard), Bald Mtn. (Penard). 



Assulina minor Penard — near Caribou and Bald Mtn. (Penard). 



Centropyxis aculeata Stein — near Caribou (Penard). 



Corythion dubium Taranck. — near Caribou (Penard). 



C. pulchellum Penard — near Caribou (Penard). 



Cryptodifflugia oviformis Penard — near Caribou (Penard). 



Cyphoderia margaritacea Schlumberger — near Caribou (Penard). 



Difflugia arcula Leidy, D. lucida Penard, D fallax Penard, D. bacilli/era Penard and 

 D. constricta Ehr., all near Caribou (Penard). D. constricta was also found by 

 Penard at an altitude of 12,500 ft., which is said to be the highest altitude known 

 for a Rhizopod. 



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