276 
It either occupies a lateral position in the red cell or a 
polar one with much displacement of the nucleus (Fig. 
90). The nucleus occupied about two-thirds of the cell. 
Free forms also occur. 
8. Hg. nicoriae. — In an amphibian tortoise 
(Nicoria trijuga ) in Ceylon. Young parasites are 
reniform. These eventually become bent on them¬ 
selves in the typical vermicule way. Their length is 
then 10/4. They displace the nucleus of the red cell. 
Specific differences are hard to define. 
Other species are Hg. billeti in Trionyx stellatus. 
Hg. labbei in Platemys sp. and Clemmys elegans , N. 
America. 
Fig. 90 . ( 1 - 3 ) Hg. stepanowia; ( 4 - 5 ) Hg. rara 
Haemogregarines in Fish 
Haemogregarines and trypanosomes are often 
found together in saltwater fish, but although trypano¬ 
somes are common in freshwater fish, haemogregarines 
are not. 
1. H. bigemina. —Discovered by Laveran in the 
blood of blennies. A vermicule form occurs free in 
the plasma. 
