JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE XII, 



Illustrating Surgeon T. R. Lewis's paper on " The Nema- 

 toid Hsematozoa of Man/' Figs. 1 — 13, The mature 

 Filaria sangmnis-liominis, ^ and ? , and some of the 

 developmental stages of the Embryos. 



Tig. 1. — Anterior portion of mature helminth. Magnified 100 diam. 



Fig. 2. —Middle portion of parasite showing alimentary canal ; and the 

 uterine tubules filled with ova. x 100 diam. 



Fig. 3. — Ova and embryos, x 300 diam. 



Fig. 4. — A portion of the male worm, with alimentary and sperm tubules 

 escaping at one of the torn ends, x 100 diam. 



Fig. 5. — Embryo recently ingested by a mosquito, x 300 diam. 



Figs. 6, 7- — Early changes undergone by the embryos in the mosquito. 



Fig. S.— ? 



Fig. 9. — More advanced stage of the development of the embryo. 

 X 300 diam. 



Fig. 10. — The " sausage-form " stage of development of the embryos. 

 X 300 diam. 



Fig. 11. — The embryos acquire more worm-like proportions, x 100 diam. 



Fig. 12. — A still further advanced stage : the alimentary canal distin- 

 guishable. X 100 diam. 



Fig. 13. — Ditto : more highly magnified (300 diameters). The re-agent 

 applied has caused the contents of the caudal end to contract. 



