266 



Fermicules. In the blood of heavily-infected 

 squirrels. They are spindle-shaped and measure 14 

 by 3*5^- They exhibit active serpentine motion, 

 and attach themselves to red cells and revolve with 

 remarkable velocity. 



Pathology. As far as is known, the squirrels do 

 not suffer from the infection, but there is a remarkable 

 change in the leucocyte values. There is a distinct 

 mononuclear leucocytosis varying with the degree of 

 infection, e.g., 10,000 per mm. 8 , instead of 4,000 

 normally; the relative value is correspondingly increased, 

 viz., 80 per cent, of mononuclears in severe infections 

 instead of 25 to 30 per cent, normally. 



Mode of Development. Is unknown. 



7. Hg. ratti (Adie). In the transitional and 

 mononuclear leucocytes of Mus rattus and Mus decu- 

 manus. Its dimensions are about 117 by 5'6/*. There 

 is no cytocyst. The nucleus is quadrilateral or oval 

 according to the aspect from which it is seen. It 

 occupies about a third of the length of the cell. 



In all cases examined so far, T. lewisi has accom- 

 panied it in the blood. 



8. Hg. boms. In the ox in Abyssinia. The 

 parasites are club-shaped, 7-10 by i'6-2^. 



HAEMOGREGARINES IN BATRACHIANS 



i. H. ranarum (= Lankesterella ranarum). Found 

 in the blood of Rana esculenta (edible frog) (Fig. 81). 

 This species includes, according to Laveran, two species 

 H. princeps and H. monilis, described -by Labbe. 

 The cycle of development is, according to Hintze, as 

 follows : 



(i) Asexual Forms or Scbizonts. These are 

 endoglobular, four to eight ^ in length. Increase 



