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| Fig. 1. Hornfly Hæmatobia serrata in resting position | 504 |
| 2. Hornflies Hæmatobia serrata on cow horn | 505 |
| 3. Buffalo gnat | 506 |
| 4. Screw worm (larva of Chrysomyia macellaria) | 506 |
| 5. Screw-worm fly Chrysomyia macellaria | 507 |
| 6. The warble fly Hypoderma lineata | 508 |
| 7. Short-nosed blue louse Hæmatopinus eurysternus of cattle | 512 |
| 8. Long-nosed blue louse Hæmatopinus vituli of cattle | 512 |
| 9. Red louse Trichodectes scalaris of cattle | 513 |
| 10. Egg of short-nosed blue louse Hæmatopinus eurysternus attached to a hair | 513 |
| 11. Mite which causes psoroptic scab of sheep | 514 |
| 12. Portion of the wall of the first stomach with conical flukes Paramphistomum cervi attached | 519 |
| 13. Twisted stomach worms Hæmonchus contortus | 519 |
| 14. Twisted stomach worms Hæmonchus contortus enlarged | 520 |
| 15. Embryo of twisted stomach worm Hæmonchus contortus coiled on tip of grass blade | 521 |
| 16. A drenching tube made from an ordinary tin funnel, a piece of rubber hose, and a piece of brass pipe | 522 |
| 17. Piece of lining of fourth stomach showing cysts of the encysted stomach worm Ostertatia ostertagi | 523 |
| 18. A tapeworm Moniezia planissima which infests cattle | 524 |
| 19. The common liver fluke Fasciola hepatica | 526 |
| 20. The large American fluke Fasciola magna | 526 |
| 21. Portion of grass stalk bearing three encysted cercariæ of the common liver fluke Fasciola hepatica | 527 |
| 22. Hydatids Echinococcus granulosus in portion of hog's liver | 528 |
| 23. Thin-necked bladder worm Tænia hydatigena from abdominal cavity of a steer | 529 |
| 24. Lung worms Dictyocaulus viviparus of cattle | 530 |
