Scientific Proceedings. (87) 23 



tively heliotropic Gatnmarus into a positively heliotropic animal is 

 produced differs for different substances and inasmuch as the trans- 

 formation is brought about most promptly by such substances 

 as diffuse most rapidly into the tissues, we must conclude that we 

 are not dealing here zvith an osmotic, but with a chemical effect. 



4 (50). " Trypanosomes and bird malaria" : F. G. NOVY and 

 W. J. MACNEAL. (Presented by GARY N. CALKINS.) 



The studies made heretofore upon the malarial parasites of 

 birds have shown the existence of four species or types. These are : 

 Proteosoma. 

 Halteridium. 



Haemamceba majoris, Lav. 

 Haemamceba Ziemanni, Lav. 



In the course of an extended study of the parasites of birds, 

 the authors encountered several new species, and, since the num- 

 ber is likely to be still further increased, it seemed desirable to 

 attempt a classification. The authors based their classification 

 largely upon the type of multiplication and the habitat of the 

 parasite. Two genera were given ; one, Plasmodium, character- 

 ized by formation of segmenting forms in the peripheral blood and 

 invasion of fully developed red blood cells. The injection of 

 blood having these parasites results in an infection. For the 

 other genus the authors used the priority name of Kruse's, Hcemo- 

 proteus. This genus is characterized by an entire absence of seg- 

 mentation-forms in the peripheral blood, and, with the exception of 

 two species which form a transition as it were between the two 

 genera, invasion of young erythroblasts is the rule. Injection of 

 blood having these parasites does not lead to infection. 



With this division, the species are arranged as follows : 



A. Plasmodium, including parasites of man, some of birds, and 



very probably some of cold-blooded animals. 



1. — Plasmodium relic turn, syn. Hcemamoeba relicta, Pro- 



teosoma. 



2. — Plasmodium vaugliani, n. sp. 



B. Hczmoproteus, including chiefly parasites of birds, and 



probably offering transitional forms to the hemogreg- 

 arines of cold-blooded animals. 



