HEMATODA. 841 



PLATE XL 



FiLARIA PaPILLOSA. 



Fig. I. — Female (nat. size). 



Fig. 2. — Male (nat. size). Notice the spirally wound taiL 



Fig. 3. — Head (mag.) 



Fig. 4.— Tail (mag.) 



Strongylus Filaria. (See Fig. 4, Plate TV.) 

 Fig. 5. — Female (nat. size). 

 Fig. 6. — Male (nat. size). 



Fig. 7. — Head (mag.) Observe that the head is round, and pro- 

 vided with a round naked mouth. 

 Fig. 8. — Tail of male (mag.) Observe the bursa with the two 

 spicules projecting from it. 



Strongylus Armatus. 



Fig. 9. — The larva and sexually mature worm from the aneurism 

 of a horse. The act of copulation is also shown ; the 

 small male is attached to the larger female by its bursa. 



Fig. 10. — Shows the anatomy of the mature male and female. 



Fig. 11. — The head. Observe the ring of teeth round the circular 

 mouth. 



Fig. 12. — The bursa. Notice the arrangement of the ribs. 



Trichina Spiralis. 



Fig. 13. — Male worm from the alimentary canal of a man (mag.) 

 Observe the pointed head and the round tail end 

 provided with a pair of conical appendages for purposes 

 of copulation. 



Fig. 14. — Part of a female from the alimentary canal (mag.) 

 Observe the young worms, some emerging from the 

 sexual aperture, and others stiU in the interior. 



Fig. 15. — Encysted trichinae in muscle (nat. size). 



Fig. 16. — The sanie (slightly magnified). 



Fig. 17. — Muscle trichina. Observe the sph-ally coiled worm in 

 the interior of the cyst. 



Trichocbphalus Affinis. 



Fig. 18. — Observe the long, thin head end of the worm, hence 

 the name Trlclwcephalus. 



