174 



THE SPOROZOA 



however, the young trophozoite grows out from the host-cell, and 

 its nucleus travels out into that portion of the body which projects 

 from the cell (Fig. 1 4, d, e). The free extremity of the Gregarine 

 body continues to grow, while the intracellular portion becomes 

 cuticularised and forms simply an organ of fixation, commonly 

 called the epimerite. The extracellular Gregarine body becomes 

 now divided by a septum into two chambers, one smaller proximal 

 (i.e. nearer the host-cell and the epimerite), termed the protomerite, 



Fio. 15. 



Cephalont of Pyxlnia 

 rubecula, Hamm. (par. Der- 

 mestes spp.) still attached 

 by its epimerite to a de- 

 tached epithelial cell. 

 (From Wasielewski, after 

 Leger.) 



Fio. 16. 



Corycdla armata, Leger (par. Gyrinus natator, larva), 

 a, cephalont ; b, epimerite in the host-cell, magnified ; 

 c, sporont. (From Wasielewski, after Leger.) 



and one larger distal, termed the deutomerite, which usually contains 

 the nucleus (Fig. 14, /); abnormal forms are sometimes found, 

 however, in which the nucleus is lodged in the protomerite, owing 

 apparently to precocious formation of the septum, before the 

 nucleus had reached its distal position. 



The young trophozoite in the Cephalina remains attached to 

 the host-cell for some time by its epimerite (Fig. 15). In this 

 condition it is known as a cephalont. Soon it becomes detached 

 and set free by a rupture of the junction between the epimerite 

 and protomerite (Fig. 16). The epimerite remains sticking in the 



