ANIMAL MICRO-PARASITES. 



591 



at the extremities, but more usually rounded off (Fig. 235). They 

 are not always curved ; some, indeed, are almost spherical, and 

 others sausage-shaped. They are motionless. In many specimens 

 a delicate Hne is \'isible on the concave side of the crescent connect- 

 ing the extremities. On careful examination this is found to be 



(S^ f^f^i' Oi^) ^9f '^cP 



o 



Fig, 236. — Rosette Forms with Seg.mentation (Golgi). 



the edge of a very dehcate membrane. The body is composed of 

 homogeneous protoplasm. Centrally placed is a collection of pigment 

 granules, which on careful examination can be distinctly seen to be 

 in movement. The semi-lunar bodies vary in number in different 

 cases. Sometimes several can be seen in the field at the same time, 

 and in other cases they are only observed after a long and patient 

 search. They are, as a rule, free in the serum ; but they have also 

 been seen within the red blood-cells. Second, finely granular masses 

 of protoplasm, which arise, according to Golgi, from the intra- 

 ■corpuscular pigmented bodies. The pigment is collected in a rosette, 

 and the protoplasm by segmentation gives rise to a number of small 



Fig. 237. —Flagellated Foems (Vandyke Carter). 

 1. A flagellated spherule ; «, the same in the interior of a phagocyte ; 6, free 

 motile filaments. 



spherical forms, which are ultimately .set free (Fig. 236). Golgi 

 believes that these changes occur in definite relation to the develop- 

 ment of the paroxysm. Third, spherical, pear-shaped, or ovoid 

 bodies, rather smaller than the red blood-corpuscles, and provided 

 with one or more actively motile flagella (Fig. 237). These flagella 



