On Flagellated Protozoa, &c. By Edgar M. Crookshank. 919 



described by Mitrophanow in the carp. I shall refer again to the 

 flagellated organisms first described by Lewis and show that his 

 woodcut and descriptions were not complete, and in some points 

 open to doubt, and that as a matter of fact, instead of a mere 

 resemblance, the rat and the Surra parasites, when stained, are 

 found to be morphologically identical. 



In a subsequent paper * Lewis acknowledges this identity after 

 further observations on the living organisms, though he still 

 failed to recognize the two remarkable characteristics, the posterior 

 spine-like process, and the longitudinal membrane. 



In the year 1883 Mitrophanow published a paper f in which 

 he gave an account of organisms in the blood of the mud-fish and 

 the carp. 



In the blood of the mud-fish (Cobitis fossilis) the organisms at 

 the first glance looked like minute nematodes, but the appearances 



Fig. 194. 



Organisms in the blood of Mud-fish (Hxmatomonas cobit'.s). 

 a, First variety ; b, second variety ; c, third variety. 



d, First variety in a state of diminished activity. 



e, The same after treatment with osmic acid. (After Mitrophanow.) 



and changes which took place on further examination showed 

 nothing in common with worms (fig. 194). As a 1 per cent, salt 

 solution had been added to the blood under examination, it occurred 



* " Further observations on Flagellated Organisms in the Blood of Animals," 

 Quart. Journ. Micr. Sci., xxiv. (1S84) pp. 357-69. 



t " Beitr'age zur Kenntniss der Hamatozoen," Biol. Centralbl., iii. (1883) 

 pp. 35-44. 



