142 HANDBOOK OF PROTOZOOLOGY 



the frog, but specific identification is indistinct. It is better and 

 safer to hold that they belong to one of the two species men- 

 tioned above, until their development and transmission be- 

 come known. 



Trypanosoma diemyctyli Tobey (Fig. 50, c). In the blood 

 of the newt, Diemyctylus viridescens. A comparatively large 

 form. Body slender and measures about 50 microns long by 

 2 to 5 microns broad, the flagellum 20 to 25 microns long. 

 Undulating membrane is well developed. 



F. Trypanosoma in Fish 



Both fresh and salt water fish are hosts to different species 

 of trypanosomes. What effects these parasites exercise upon 

 the host fish are not understood. Ordinarily only a few in- 

 dividuals are found in a host fish. 



Trypanosoma granulosum Laveran and Mesnil (Fig. 50, e). 

 In the eel, Anguilla vulgaris. Total length 70 to 80 microns. 



Trypanosoma giganteum Neumann (Fig. 50, d). In Raja 

 oxyrhynchus. Total length 125 to 130 microns. 



Trypanosoma remaki Laveran and Mesnil (Fig. 50, /). In 

 Lucius lucius, L. reticulatus and probably other species. Di- 

 morphic. Total length 24 to 33 microns. 



Trypanosoma percae Brumpt (Fig. 50, g). In Perca fluvia- 

 tilis. Total length 45 to 50 microns. 



Trypanosoma danilewskyi Laveran and Mesnil (Fig. 50, h). 

 In the carp and goldfish. Widely distributed. About 40 mi- 

 crons long. 



Trypanosoma rajae Laveran and Mesnil (Fig. 50, i). In 

 various species of Raja. Length 30 to 35 microns. 



Genus Crithidia Leger. Parasitic in arthropods and other 

 invertebrates. The blepharoplast is located between the cen- 

 trally located nucleus and the end from which the flagellum pro- 

 jects (Fig. 47). The undulating membrane is thus not so well 

 developed as in Trypanosoma. The organism may lose the 

 flagellum and form a leptomonas or rounded leishmania stage 

 which leaves the host intestine with fecal matter and becomes 

 the source of infection in other host animals. 



Crithidia euryophthalmi McCulloch (Fig. 51, a-c). In the 

 gut of the bug, Euryophthalmus convivus which feeds on Lupinus 



