PARASITES OP ANIMALS. 67 



NEMATODES. 



Ascaris megalocephala Cloquet. Small intestine ; common. 



Oxyuris curvula Rudolphi. Colon, coecum, rectum ; common. 



Eustrongylus gigas Diesing. Kidney, etc. 



Sclerostoma equinum Blainv. Duodenum, colon, coecum, pan- 

 creas, sometimes very numerous, and in enlargements of 

 the arteries; common. 



S. tetraoanthum Diesing. Duodenum, ccecum, .colon. 



Strongylus micrurus Mehlis. Trachea and bronchial tubes. 



Filaria microstoma Schneider. 



F. papillosa Rud. Abdomen, thorax, brain, eye, intestine. 



F. lachrymal Gurlt. About the eyes, in lachrymal ducts, etc. 



Spiroptera megastoma Rud. Tubercles in stomach. 



Dracunculus medinensis Cobbold. (Guinea-worm). Subcu- 

 taneous tissues ; only in tropical parts of Africa, Asia, and 

 America. 



ACARINA. 



Pentastoma tamioides Rud. Nasal cavities, larynx, etc. 



The mule and ass are subject to the same parasites as the 

 horse, but not to the same extent. The number of species 

 hitherto observed is less, and they are far less common. 



INTERNAL PARASITES OF THE HOG. 



CESTODES. 



Tcenia solium Linn. In the larval or cysticurcus state in the 



abdominal viscera. 



T. marginata Kiich. Cysticercus state in the abdominal viscera. 

 T. echmococcus Siebold. Hydatid state in liver, etc.; not 



common. 



TREMATODES. 



Fasciola hepatica Linn. Liver and bile ducts. 

 Distoma lanceolatum Mehlis. Bile ducts. 



ACANTHOCEPHALA. 



Echinorhynchus gigas Goeze. Small intestine ; common. 



NEMATODES. 



Trichina spiralis Owen. Mature in intestine, young in mus- 

 cles ; common. 



