300 



IT. M. WOODCOCK. 



" millet-eaters" (Estrelcla estreld), in Senegambia. (I.) host probably 

 (for this and other Avian forms) some species of gnat or mosquito. 



Another form, not named, is described by the same authors from the same 

 host and also from another (Crithagra). The birds were more frequently 

 infected with this j^arasite than with T. johnstoni. This Trypanosoma 

 represents the other extreme of type, being relatively very wide and stumpy 

 (fig. 52). Its total length is about 32 /t, and its greatest width S/u. The 

 free portion of the flagellum is from 10 — 12 fj, long. The trophonucleus is 

 placed transversely across the body. The kinetonucleus is very close to the 

 anterior end, and immediately behind it is a vacuole. 



Trypanosomes from Indian Birds. — Hanna (26) has recently noted 

 two forms, one parasitic in the crow, the other in the pigeon. The former 



Fig, 54. 



Fig. 55. 



Fig. 54. — T. naddte, Thiroux. At x the base of the flagellum 

 is separate from the kinetonucleus, and thickened prior to division. 

 X 1200. (After Thiroux.) 



Fig. 55. — T. avium. Here the kinetonucleus is itself divided. 

 (After L. and M.) 



is only briefly mentioned, since, owing to the preparation having lost its 

 staining colour, little beyond the general form could be made out. The 

 parasite appears to conform to the usual spindle-like shape. Its size is 

 given as from 40 — 56 fi by 3 — 4"8)u. The other parasite (fig. 53), from the 

 pigeon, is more fully described, and possesses several points of interest. It 

 also is relatively very wide, but not at all stumpy. Its length is from 45 

 — 60 /t, breadth 6 — 8/t. The posterior part tapers away finely, and there is 

 a free prolongation of the flagellum. The characteristic feature, however, 

 is the long, drawn-out and extremely thread-like anterior end. The kineto- 

 nucleus is, correspondingly, a considerable distance from the anterior end, 

 and behind it is a vacuole. In this case, also, the trophonucleus stretches 

 transversely across the body, and is of a curious triangular shape. The 

 surface of the body exhibits longitudinal striations. This Trypanosome is 

 most probably quite distinct from Dutton and Todd's parasite. 



