355 



Nucleus close to it. Undulating membrane much 

 folded. Flagellum, 10/4. 



\b. T. costatum^ Var. II : Striations, but not 

 always well defined, 37 by 14/4. Blepharoplast, 10/4 

 from posterior end. Nucleus close to it. Undulating 

 membrane much folded. Flagellum, 24/4. 



\c. T. rotator ium (s. strict}. Non-striated, but 

 very full of staining granules. 38/4 by 18/4. Blepharo- 

 plast about 3/4 from posterior end. Nucleus very long, 

 17/4 by 2/4, 13/4 from the anterior extremity. Undu- 

 lating membrane much folded. Flagellum, 22-30/4. 

 During division it becomes round, losing its membrane 

 and flagellum. 



Id. T. inopinatum. Fide below. 



\e. T. undulans. 32 by 7*5/4. Blepharoplast 

 10/4 from posterior end. Nucleus about the middle. 

 Usually no free flagellum. 



I/. T. gracile (S and C). syn. T. elegans (F and 

 A). 36 by 3/4. Longer and thinner than previous 

 one. Free flagellum very short, about 3^. 



2. T. mega. In a Gambian frog. 72/4 by 8/4, 

 not including the flagellum 10-15/4. 



3. T. karyozeukton. In a Gambian frog. 57 

 by 3*5/1,. Flagellum 15/4. A chain of granules joins 

 the two nuclei. 



4. T. rotatorium, var, nana. In R. esculenta, 

 Algeria. Average length, 22*4. 



5. T. inopinatum. In R. esculenta in Algeria, 

 25-30/4, including flagellum. Is pathogenic to frogs, 

 producing oedema, hydro-pericardium, ascites, hae- 

 morrhages. Trypanosomes are abundant in the blood. 

 It has been thought that the trypanosome is a flagellate 

 stage of one of the haemogregarines of the frog. 

 Leeches (Helobdella algird) transmit the disease for as 

 late as a month after their infection. 



