353 



lo. T. cobitis (MiTRAPHANow). — In the blood 

 of the mud-fish (Cobitis fossilts). Thirty lo forty m 

 long, one to two m broad. Flagelluni ten to 

 fifteen m- It is long and thin. Forms without an 

 undulating membrane are described, and also 

 without a flagellum (Fig. 79). 



Trypanosomata of Batrachians 



I. T. rotatorium. — Occurs in various species 

 of frogs : Rana esculenia, R. temporaria, Hyla 

 arborea, etc. It is characterised by extreme varia- 

 tion both in dimensions and in appearance. Thus 

 we have (i) forms with striation (Fig. 79) ; (ii) 

 forms without striation ; (iii) spherical forms in 

 which the undulating membrane is retracted. 



The position of the blepharoplast or centro- 

 some is also variable. Generally, it lies close to 

 the nucleus, and, consequently, the membrane 

 does not extend further back than this point ; at 

 other times it lies near to posterior end, with a 

 consequent more extensive development of the 

 membrane. 



Dimensions : 40-60 m long, by 5-40 m broad. 



It is doubtful whether the trypanosome 

 occurring in these frogs belongs to one or to 

 several species. 



2-. T. mega. — In a Gambian frog. (Vide 

 Plate IV, Fig. 4). 



3. T. karyo.zeukton. — In a Gambian frog. (Vide 

 Plate IV, Fig. 5). 



Laveran and Mesnil think that these may 

 only be varieties of T. rotatorium. 



4. T. inopinatum. — Occurs in Rana esculenta 

 in Algeria. 25-30 m long (including flagellum), 



Y 



