Hygienic Laboratory, Bulletin 46. 
Plate XVI. 
Figs. 1-11. — Free vermicnles. Drawn from a fresh preparation, prepared by mixing ripe sporo- 
cysts from a crushed mite with duodenal juice obtained from a freshly killed healthy rat. 
Figs. 1-2.— Sporozoites unchanged. Figs. 3-11.— Sporozoites which have become active ver- 
micules; showing striation (exaggerated) and various shapes assumed. Fig. 12.— Sporocyst 
from freshly crushed mite; showing central “rest” body and young sporozoites at the 
extremities. Figs. 13-14. — Lateral and end views of fresh sporocysts, showing completely 
developed sporozoites and small “rest” body. 
