16 



movement over them of scabby sheep, but a competent imspector 

 should be appointed by the State to supervise every sheep dipping, to 

 compel the dipping of every scabby flock, and to attend to the renova- 

 tion and disinfection of the sheep-yards and walks. Every band of 

 scabby sheep is a constant menace to the health of others. In this 

 country there seems to be no sheep disease produced by animal para- 

 sites which renders the flesh harmful to man, further than that some 

 of the flesh may be less nutritious. Until the sale of meat of all kinds 

 is guarded by more stringent regulations there does not seem to be any 

 reason for urging police restrictions on the sale of meats of the inferior 

 quality which some of these diseased lambs undoubtedly furnish. 



There are described in this vx)lume twenty-six species of animal para- 

 sites of sheep, as follows : 



1. CEstrus ovis. 



2. Melophaqus ovimis. 



3. Triohodectes sphwroce^halus. 



4. Triohodectes climax. 



5. Trichodectes limiatus. 



6. Psoroxttes communis. 



7. Lingualula tcenioides. 



8. Twnia fimiriata. 



9. T<enia expansa. 



10. Twnia marginata. 



11. Tcenia tenella. 



12. Twnia ccenurus. 



13. Twnia ecliinococcus. 



14. Distoma liejjaticum. 



15. Amphistoma conicum. 



16. Distoma lanceolatum. 



17. Strongylus coniortus. 



18. Strongi/Jus fiJicoUis. 



19. Strongylus ventricosus, 



20. Ascaris lumiricoides. 



21. Doclimius cernuus. 



22. Solerostoma hypostomum. 



23. (Esophagostoma Colunibianum. 



24. Trichoceplialus affinis. 



25. Strongylus ovis-pulmonalis. 



26. Strongylus filaria. 



Of the species described three genera — Melophagiis, Trichodectes, and 

 Psoroptes, embracing five species, M. ovimis, T. splicer ocephalus, T. cli- 

 max, T, limbatus, and P. communis — are external j)arasites. 



The species which there is reason to think do not occur in this coun- 

 try are Tcenia tenella and Amphistoma conicum. The former is consid- 

 ered by continental authorities as a synonym of T. solium or T. margi- 

 nata. The writer has not found Linguatula tcenioides, Tcenia. ccenurus, 

 T. echinococcus, Distoma hepaticum, or D. lanceolatum in sheep, nor 

 learned from authentic sourcesof any of these occurring here except X). 

 hepaticum. The other species may eventually be found, but they will 

 probably be rare. One other species, Ascaris lumbricoides, seems to 

 be a rare one in sheep. The remaining species are all more or less 

 abundant. Tcenia Jimhriata and CEsophagostoma Golumbianum seem to 

 be exclusively American species. The others are common to all parts 

 of the world where there are sheep. Von lAn&tow {Compendium der 

 Helminthology, 1878), catalogues nineteen species of internal parasites 

 which infest European sheep. One of these, Monodontus Wedlii, Molin, 

 is a synonym of Dochmius cernuus Oreplin; another, Nematoideum 

 ovis, Diesing, is a lung-worm insufflciently described. Still another, 

 Trichosoma papillosum Wedl., is a synonym of Strongylus filicollis, End. 

 The remaining sixteen species are described in this volume. There are 



