On Flagellated Protozoa, &c. By Edgar M. Crookshank. 921 



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

 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 



Fig. 195. 



Organisms in the blood of the carp. 



a, b, c, Hgematomcnas carassii. d, e,f, g, h, other organisms in the same blood. 



(After Mitrophanow.) 



but developmental forms. He considered that these organisms 

 were infusoria between the genera Cercomonas and Tricho- 

 monas, 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 — Heematomonas, defining this genus as follows : — 

 Parasites of normal fish-blood, worm-like, actively moving organ- 

 isms, with indistinct differentiation of body parenchyma. Bodies 

 pointed at both ends, 30 to 40 /x long and 1 to 1^ fi wide. 

 May possess in front a flagellum, and on one side an undulating 

 membrane. 



Species : — 



Heematomonas colitis. — Body provided with a spiral membrane 

 and a flagellum at the fore-end. Parenchyma of body homo- 

 geneous. Second variety, body and flagellum only. Movement 

 modulatory, body containing highly refractive spherules. Third 

 variety, plasma- like body, without membrane or flagellum ; quickly 



* Vide Leuckart, ' The Parasites of Man,' translated by Hoyle, p. 248. 



