598 



APPENDICES. 



sites. But the union obviously took place by the noil- flagellated 

 ends, for the two flagella were frequently turned in the same 

 direction, so that the fused parasites resembled, as Evans sub- 

 sequently suggested, a trophy of buffalo horns. Here and there 

 more than two parasites had united, forming a stellate group ; and 

 in one case the author noticed that the individuals had apparently 

 united with their non-flagellated ends just overlapping, so that the 

 unstained spot in one was just situated in a line with the unstained 

 spot of the other. 



In Evans's Report, Lewis's opinion is given that these parasites 

 differed slightly, but still were closely allied to certain flagellated 

 organisms which had been observed by him in rats in India. On 



FIG. 238. "SURRA" PARASITES OCCURRING SINGLY AND FUSED. 

 (From preparations stained with magenta, x 1200. Lent by Dr. Evans.) 



referring to his original memoir, it will be found that his description 

 and woodcut differed very materially from the Surra parasite as 

 just described, though a microphotograph which Lewis had appended 

 to the memoir after it was written, indicated a great similarity 

 to this organism. To the author the organisms appeared not only 

 closely allied, but, as far as one can judge from figures and descrip- 

 tions, morphologically identical with the parasites described by 

 Mitrophanow in the carp, and as a matter of fact, instead of a 

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

 are found to be morphologically identical. 



-, 



