ANIMAL MICRO-PARASITES. 605 



two highly refractive spherules in the protoplasm ; and another with 

 neither membrane nor flagellum, consisting of very granular proto- 

 plasm with several refractive spherules, and capable of protruding 

 processes like pseudopodia. 



In the carp (Fig. 244) the parasite is perceptibly larger, and 

 possesses an undulating membrane fastened along the edge of the 

 long body. When the body bent first towards one side and then to 

 the other, a wave-like movement was observable at the free edge of 

 this membrane. 



These parasites were found in all the mud-fish examined except 



Fig. 244. — Organisms in the Blood op the Carp. 



a, 5j c, JETcBmatomonas carassii ; d, e, f, g, h, other organisms in the same blood 



(Mitrophanow). 



one, and in greater numbers in the hot months. In the carp 

 they were only found occasionally. Mitrophanow described other 

 varieties, which he considered were possibly not complete organisms, 

 but developmental forms. He considered that these organisms were 

 infusoria between the genera Cercomonas and Trichomonas, with 

 great similarity to the Trichomonas described in the Lieberkuhn's 

 glands of fowls and ducks (Eberth). 



On account of their special habitat, Mitrophanow suggested a 

 new genus — Hsematomonas, defining this genus as follows : — Parasites 

 of normal fish-blood, worm-Kke, actively moving organisms, with 

 indistinct differentiation of body parenchyma. Bodies pointed at 



