XExMATODA. 839 



PLATE IX. 



AscARis Megalocephala. 



Figs. 1, 2. — Male and female worms (nat. size). 



ASCARIS LUMBRICOIDES. 



Fio. 3. — Dissection of a female, witli the parts laid out. 

 Fig. 4. — a, b. Head ; c. Tail with spicules. 



EUSTRONGYLUS GiGAS. 



Fig. 5. — The ovum; a shows the form of the shell and the markings 

 on its surface ; 6. is a section of the ovum, showing the 

 thick shell with the embryo coiled up in the interior. 



Fig. 6. — a. Male worm (nat. size); h. Embryo worm. 



AscARis Mystax. 



Fig. 7. — a. Natural size ; h. Heart-shaped head (mag.) 



OXYDRIS VeRMICULARIS. 



Fig. 8. — a. Male (nat. size). 

 h. Female (nat. size), 



6". Female (mag.) showing the internal organs. 

 d. Female (mag.) loaded with eggs, so that now the 

 conspicuous part is the swollen uterus. 



Fig. 9. — a. Ovum (mag.); b. Division has commenced; c. Embryo 

 forming; d. Embryo emerging from the egg shell; 

 e. Embryo free from the egg ; /. Further advanced. 



oxyuris curvula. — fig. 10. 



Fertilisation of Ascaris. 



Fig. 11. — a. Amoeboid sporraatozoids. 

 b. Impregnation of the ovuui 



