E. A. Watson and S. Hadwen 
25 
suffered no ill effects. This giant trypanosome, which measures 55 yu. in 
length, may possibly belong to the tJieileri group. The body of the 
organism has a broad or stumpy appearance and anteriorly is not finely 
drawn out as in T. theileri, but, on the contrary, terminates somewhat 
abruptly and has only a very short free flagellum. Pusteriorly, a slender 
filament is extruded from the rounded end of the body. The nucleus is 
situated posterior to the centre, the endoplasm appears coarsely granular 
and is profusely vacuolated. No doubt this is an old form of the parasite 
and probably is at the commencement of degeneration. 
Trypanosoma evotomys n. sp. Hadwen. 
(PI. II. fig. 7.) 
Found in a vole, Evotomys saturatvs (Rhoads) at Mount Lehman, 
B. C., on 27.7.11. (Hadwen.) 
A long parasite, average length 26'5 jx, differing from T. lewisi in 
having the nucleus close to the centre, and in possessing a well-developed 
undulating membrane and a much larger centrosome. The distance 
between centrosome and nucleus is much less than in T. leporis-sylvaticus, 
T. peromysci, and T. citelli (compare with figs. 1, 2, 3, 5 and 6). 
Found in two mice out of ten examined. 
Non-pathogenic for two rabbits inoculated 27.7.11, still alive on 
10.10.11. (Hadwen.) Also non-pathogenic for guinea-pigs. (Dr 
McKee.) 
Trypanosoma soricis n. sp. Hadwen. 
(PI. II. figs. 8, 9.) 
Found in blood of wandering shrew, Sorex Vagrans'^ (Baird) at Mount 
Lehman, B. C., on 28.7.11. (Hadwen.) 
A short active parasite with the nucleus in centre, undulating 
membrane well marked, and a very short free flagellum. The organ¬ 
ism is broad and stumpy and the total length only 17'5 p. Found in 
two out of five mice examined. Apparently non-pathogenic. 
We are indebted to Dr J. C. Rutherford, C.M.Gl., Veterinary Director 
General, for permission to publish these notes. 
1 These mice were kindly identified by F. Kermode, Curator of the Provincial Museum, 
Victoria, B. C. 
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