THE PROTOZOA OF THE UNIVERSITY CAMPUS 



[Dr, C. H. Edmondson, of the Iowa Wesleyan University, having very kindly 

 oflfered to work up Protozoa from Boulder, I sent him a small collection of material 

 from the University campus. It all came from the south end of the lake or pond, and 

 from the little marsh immediately south of it, across the road. The number of species 

 reported is so great that it seems worth while to put them on record; and in so doing, 

 I have thrown the list into the form of a key. The characters in the key are derived 

 from Dr. Edmondson's recent excellent work on the Protozoa of Iowa {Proc. Davenp. 

 Acad. Sci., 1906), and in part from Dr. H. W. Conn's Protozoa of the Fresh Waters 

 of Connecticut (1905). Dr. Edmondson reports that there were in the gathering a 

 few other species which he did not recognize, and to which he well give further study. 

 The Protozoa of Colorado have hitherto been known from the list given by Professor 

 Arthur E. Beardsley in Trans. Amer. Micr. Society, May 1902. This Ust includes 

 99 species, of which four are described as new. The list from the University campus 

 includes 45 species, of which 20 are ostensibly absent from Professor Beardsley's list; 

 these are marked below with an asterisk. This would bring the Colorado Ust up 

 to 119, but there is doubtless some synonymy involved. In writing Amceba proteus 

 Leidy, I follow Edmondson and Conn, but according to the rules of nomenclature 

 this name is not vaUd. Stiles and Hassall (Bureau of Animal Industry, U. S. Dept. 

 Agric, Bull 79, 1905, p. 38) have discussed this matter at some length, arriving at 

 the conclusion, on the principle of "tautonomy," that the animal is entitled to the 

 designation Chaos chaos (L.). However, on the "first species" principle, and also 

 on that of "eUmination," the generic name Chaos does not apply to the amoeba, 

 and it is questionable whether it ought to be adopted. Discarding Chaos, the name 

 Antiba, Bory 1822, takes precedence over the altered spelling Amoeba Ehrenberg, 

 1830, and the common species becomes Amiba chaos (L.) based on Volvox chaos L., 

 1758. Beardsley records three other species of the genus from Colorado: 



Amiba Umax Duj. 



Amiba spatula Penard. Having two forms, one radiate, floating, 10-12 /» 

 diameter, the other spatulate, crawling, 20-25 /* diameter. 



Amiba radiosa Ehr., with long, slender, pointed pseudopodia; diameter of 

 body up to 45/* (A. chaos reaches 250 m or over). 

 It is of interest to record that E. Penard, now so well known as an authority on 

 the Rhizopods, was at one time Uving in Boulder, the guest of Professor John Gar- 

 diner. I have not been able to ascertain that he published anything on the Protozoa 

 of Colorado. T. D. A. Cockerell] 



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