238 UNIVERSITY OF COLORADO STUDIES 



Order HEMOSPORIDIA Danilewsky 



Living in blood. 



Family PLASMODIIDiE 



The genus Plasmodium, the cause of malaria, is apparently not normally present 

 in Boulder County, nor has the sporogonic host {Anopheles) been observed. The 

 tick which carries the parasite {Babesia) supposed to cause Rocky Mountain 

 Spotted Fever occurs here, but the parasite is probably absent, as the disease has 

 not been reported. 



SuBPHYLUM Sarcodina 



Protozoa showing no connections with the bacteria, usually of simple structure 

 and characterized mainly by motile organs in the form of changeable protoplas- 

 mic processes — the pseudopodia (Calkins). Calkins includes the mycetozoa here, 

 but their swarm-cells are flagellate, and for several reasons it seems impossible to 

 regard them as Sarcodina. 



Class RHIZOPODA 



Sarcodina without axial filaments in the pseudopodia, which may be lobose, filose 

 or reticulate. 



Subclass AMEBEA 



Our principal source of information is E. Penard's great work, Faime Rhizopodique 

 du Bassin du Lenian, which although ostensibly dealing with a single district in 

 Europe is in reality a monograph of the species of the world. 



Order GYMNAMEBIDA 



Body uncovered, though there is, in many cases, a tendency of the peripheral 

 plasm to harden into a denser, membrane-like zone which approaches the simpler 

 forms of tests (Calkins). 



Family AMIBID^ 

 The "kleine Proteus" of Rosel (1755), the basis of Chaos L., was, from its size, 

 probably Pelomyxa, as remarked by Dr. E. L. Walker. The genus Proteus was 

 however based by Miiller on an animal actually observed by him, P. diffluens, 

 which was the Amoeba proteus of modern authors. Proteus being preoccupied, 

 Bory de St. Vincent substituted Amiba, which appears to be valid. I have not 

 examined Miiller's work, but E. Donovan {Nat. Hist. British Insects, Vol. 2, 1793) 

 gives a good figure of the common Amoeba as Proteus diffluens (Plate XL VII, 

 p. 27). 

 (37) Amiba Bory. Body naked, with pseudopodia; contractile vacuole and 

 nucleus present. A. diffluens (Miill.)*; A. verrucosa Ehr.; A. Umax Duj.; A. 

 radiosa Ehr. Penard long ago reported a doubtfully new species from Bald Mtn. 

 (alt. 11,470 ft.). He now kindly informs me that this was what he subsequently 

 described from Spitzbergen as A. radiosa var. gemmifera (Penard, 1903). 

 Calkins places provisionally in Gymnamebida the organisms connected with 

 smallpox and rabies, both of which diseases have occurred recently in our area. 



