STUDY OF COCCIDIA MET WITH IN MICE. 283 



smaller dimensions of the epithelial cells of the intestine of 

 the mouse as compared with those of the rabbit. 



4. That the appearance of large numbers of swarm-spores in 

 the gastric glands of the mouse is very similar to that pre- 

 sented by the Sarcosporidia, and suggests that the latter is 

 but one phase of a Sporozoou which may have in other phases 

 a form resembling that of the Coccidia. A similar conclusion 

 to this has been arrived at by L. PfeifFer as the result of com- 

 paring Klossia with the Sarcosporidia. 

 October 3rd, 1894. 



EXPLANATION OF PLATE 30, 



Illustrating Mr. J. Jackson Clarke's paper, " A Study of 

 Coccidia met with in Mice.'' 



f IG. 1. — Ripe Coccidium, as seen with -^^ o. i. immediately aftei' removal 

 from the body of the mouse. 



Fig. 2. — Coccidium after six days in the moist chamber. 



Fig. 3. — The same after the same length of time. 



Fig. 4. — The same after eight days. 



Fig. 5.— The same, 10th day. 



Fig. 6.— The same, 12th day. 



Fig. 7. — Section of a duct of a cardiac gland (mouse's stomach). 



Fig. 8. — Eucapsuled parasite subdivided into sickle-shaped swarm-spores, 

 examined fresh from the mouse's stomach. 



Fig. 9. — Cross-section of duct of a pyloric gland. 



Fig. 10. — Cross-section of a gland of the small intestine of a mouse, show- 

 ing two large naked intracellular parasites with close-set peripheral bars of 

 chromatin. The darker points on the surface of the parasite appear to mark 

 the commencement of subdivision. 



Fig. 11. — Naked and free coccidium from a section of a rabbit's liver, 

 showing the mode of subdivision of a naked parasite with peripheral chromatin 

 bars. 



Fig. 12. — The same, showing another phase of subdivision. 



