of trypanosome from the freshwater Catfish Copidocjhinis 

 tundiiiniH, of Queensland rivers. The first specimens Dr. 

 Bancroft obtained are shown in a slide he has forwarded to 

 us, labelled and dated as follows:—" Trypanosome in blood 

 of the Freshwater Catfish, discovered 17 12/'05." This 

 slide shows the very narrow forms with very short flagella 

 to be shortly described, and also several broader forms with 

 basophile granules. In May 1910, we first received from 

 Dr. Bancroft a series of blood-slides from ten of these fish 

 recently taken at Kilroy, Queensland. An examination of 

 these revealed the presence of trypan osomes in only one, 

 but in this one which we have taken as our type slide, the 

 parasites were moderately numerous and of diverse forms. 

 Since then, a further blood slide, dated 275/ , 10, has been 

 received from Dr. Bancroft, in which a single trypanosome 

 was found which, though it differs materially from the 

 specimens we have examined from the other two infected 

 fish, we believe to be a form of the same species— a species 

 apparently characterised by considerable pleomorphism. 

 An examination of the type slide discloses the following 

 variations of the parasite : — 



(o) Very narrow (under 3 to under 2/0, comparatively 

 short (27 to 31/*) forms. These show a well-marked kineto- 

 nucleus about 1/x from the pointed posterior end; a well- 

 marked trophonuclens 8 to 12"5» in front of this : and the 

 body passing into the flagellum about Q/i still further for- 

 ward. The flagellum in some specimens is about 11/* long, 

 in others, apparently only about 4/* in length ; while in 

 quite a number of examples very little, if any, of this 

 structure was discernible. We are inclined to think that 

 in these specimens a short flagellum was rendered not 

 visible by injury during, or defects in, preservation. In 

 one specimen some blue granular masses were irregularly 

 distributed in the protoplasm. 



