2 1 (') 



PROTOZOA. 



iiKicrogametes whicli are fertilized Ity the microgamctes, and then 

 encj'st, pass to the outside, and serve for the infection of other 

 animals. The contents of the c)'st ?jegin to divide, sooner or 

 later, into sporoblasts (in C'occidium, four) containing spores, the 



a h (: d e 



Fig. m^.—Cocciflium cuniculi, from the liver of the rabbit (from Wasielewski. a. &, 

 young CoccidUt in the epithelial cells of bile duct, the nucleus of the cell in tlie 

 upper process; c, encysted; <}, c, contraction of iirotoplasni; </, //. /. sp*jre forma- 

 tion; /.■, ripe spore with tvro germs and a residual liody. 



jirocess being completed only after entrance into a new host. 

 Each spore forms one or more sjDorozoites, a portion of the sub- 

 stance being left behind. Coccidium cunicidi {oriforme) in the 

 liver of mammals, esiiecially rabbits (rare in man), producing 

 cheesy granules. 0. perforans in the intestine of rabbits, rare in 

 man. 



Order III. Hsemosporida. 

 In structure and development these are much like the C'occidia?; 

 they live in blood corpuscles. The forms occurring in man pro- 

 duce malaria. Here, also, there are endogenous (autoinfecting) 

 and exogenous generations transferring the parasites to other 

 hosts. The j^arasites in the corpuscles (tig. 157, a. to (/) otoav and 



a h c d e f 



e®e 



Fsa l5,.-~Ptnsmod,um. lavm,,, v;ir. quart, ,w, (from Wasielewski, after Lahhel from 

 the blood of a malarial man. „, newly infected Id.n.d corpuscle- ; % unewh at 

 larger germs; c, full-grown parasite with sirong pignuM.tation ; l' Voun "d fo ■ 

 ivith large nucleus; ,■, heginiung ,,f germ formati.,n; t. rosette ..t ierms arouml a 

 residual body; y, germs set free by degeneration of coi'puscle. 



divide, producing 'daisy-like forms' characterized by little accu- 

 mulations of jiigmcnt derived from the ha-moolobin of the blood. 



