349 



if not identical trypanosome occurs in Togo, German 

 East Africa, Transcaucasia and India (T. lingardi). 



Symptoms. (i) Progressive anaemia ; (2) Slight 

 fever lasting a few days only. The disease in South 

 Africa is often complicated by infection with Piroplasma 

 or Spirochaetes. The trypanosome is strictly specific, 

 i.e., only cattle can be infected. 



Blood Examination. Trypanosomes are found 

 during the first fortnight of the disease. 



Morphology. (i) It is the largest of known try- 

 panosomes. Two forms occur (a) T. theileri, (i) large 

 forms 60-70/4 by 4-5^ ; (ii) small forms 25-530/4 

 by 2-3/4. (b) T. transvaaliense. In this form the 

 oval nucleus is posterior almost touching the blepharo- 

 plast 18-50/4 by 4-6/4. Whether these two forms are 

 different, or varieties, or developmental forms of one 

 another, is doubtful. 



(2) Another characteristic feature is the extremely 

 drawn-out posterior end. 



(3) The blepharoplast is oval, situated at right 

 angles to the long axis (cp. T. lewisi), and often 

 appears as if partly divided (diplosome). 



In this trypanosome, from its great size, the 

 mynoneme fibres are fairly readily seen, in stained 

 specimens, in those parts where the trypanosomes have 

 suffered compression. 



Pathology. There is icterus of the tissues. The 

 spleen and mesenteric glands are enlarged. Whether 

 these changes are due to the trypanosomes or some 

 other co-existent infection is doubtful. 



Transmission. The disease in South Africa is 

 transmitted by Hippobosca rufipes. 



7. T. dimorphum (Laveran and Mesnil, 1904). 

 The cause of a chronic disease in horses in Gambia. 



