ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 683 



Trypanosoma brucei is inoculated into dogs an injection of emulsion of 

 ox-spleen causes their disappearance within three days. 



Life-history of Spirochseta pallida.* — Fr. Krzysztalowicz and 

 M. Siedlecki discuss the life-history of this " Flagellate Protozoon " 

 found by Sohaudinn in syphilitic lesions, and show that one of the phases 

 in its cycle is a Trypanosoma form to which they apply the name 

 Trypanosoma luis. 



The Genus Piroplasma.f — H. B. Fantham gives an account of 

 Piroplasma maris sp. n., occurring in the blood, liver, spleen, etc., of 

 white rats. The parasite is usually ovoid or pyriform in the tropho- 

 zoite stage, generally with a single well-marked chromatin dot ; it 

 multiplies by binary fission into two merozoites ; melanin pigment is 

 absent. Investigation has shown that the genus Piroplasma stands 

 distinctly apart from the other Hsemosporidia. It may be that the 

 Hasmosporidia, as at present understood, form a heterogeneous group. 



Myxosporidian in South African Rotifer.} — E. Warren gives some 

 account of the structure and life-history of Bertramia kirkmani sp. n., 

 which has been found in about 60 p.c. of collected examples of a species 

 of Gopeus occurring at Pietermaritzburg. This parasite exhibits un- 

 doubted affinities with the Sarcosporidia, but it differs from them in 

 that the trabeculse divide the trophoplasm into single spores, and not 

 into pansporoblasts. No trace of a polar capsule, or even the striated 

 area described in the spores of Sarcocystis, could be detected. It differs 

 from a typical Myxosporidium in that spore formation typically termi- 

 nates the trophozoite stage, the whole of the trophoplasm being converted 

 into the spores. Bertramia kirkmani is to be regarded as derived from 

 a Myxosporidian ancestor, its structure and life-history having become 

 modified and simplified in accordance with the special conditions occur- 

 ring in its comparatively short-lived host. 



* Bull. Internat. Acad. Sci. Cracovie, No. 9 (1905) pp. 713-28 (1 pi.), 

 t Quart. Journ. Micr. Sci., 1. No. 199 (1906) pp. 493-516 (1 pi.). 

 % Annals Natal Government Museum, i. (1906) pp. 7-17 (1 pi.). 



-K^= I » 



