266 
Vermicules. —In the blood of heavily-infected 
squirrels. They are spindle-shaped and measure 14 
by 3‘5A 6 - 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. 3 , 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 11*7 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. hovis. —In the ox in Abyssinia. The 
parasites are club-shaped, 7-10 by 1*6-2^. 
Haemogregarines in Batrachians 
1. H. ranarum (= Lankesterellaranarum). 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 Schizonts. —These are 
endoglobular, four to eight /* in length. Increase 
