TRYPANOSOMA IN BIRDS IN I^DIA. 



435 



are tlie rather abrupt termination of the posterior extremity; 

 the breadth of the parasite (3 — 4-8 ju) is not so great as that 

 of the parasite in the pigeon, and the micronucleus is also 

 much nearer the posterior end. 



The crow trypanosoma has more of the shape of T. Lewisii 

 or T. Bruce i; it is, however, much larger. 



In anticipation of further work being done on these 

 interesting Protozoa, and for purposes of identification, I 

 give the following measurements : 



Trypanosoma of domestic pigeon (Indian) — 



Length of organism . . . 45 — 60^. 



Breadth of organism opposite nucleus . 6 — 8/(. 

 Length from micronucleus to posterior 



end ..... 19— 22|u. 

 Length from micronucleus to centre of 



macronucleus .... 4 — G"5 /n. 

 Length from macronucleus to anterior 



end . . . . . 25—30/^. 



Depth of undulating membrane . . '7 jn. 



Trypanosoma of crow (Indian) — 



Length of organism . . . 40- 



Breadth of organism . . . 3- 



Length from micronucleus to posterior 



end .... . 8— 9-5|u. 



Length from micronucleus to anterior 



end .... 



-56^. 

 -4-8 /L/. 



. 32—46-5^. 



Amongst the group Mammalia several species of trypano- 

 soma have been described. Gros, in 1845, found a parasite 

 much resembling a trypanosoma in the blood of the field- 

 mouse. Lewis, in 1879, described a species (6) which was 

 found to be exceedingly common in the blood of rats (Mus 

 rattus, decumanus, and rufescens), also in the hamster 

 (Cricetus arvalis). The length of this organism, including 

 the flagellum, is 24 — 25/i, and its breadth 1'5^. In many 

 cases 25 — 29 per cent, of wild rats are found infected. In 

 India (Bombay) 12 per cent, of the rats harbour the parasite. 



