TRANSMIGRATIONS AND METAMORPHOSES. 



239 



organs in mammals and birds. A very remarkable 

 species, the Strongylus gigas (Fig. 66), exists in the 



Fig 86.— Strongylus gigas.—l, fomale, showing a, the mouth; 6, the intestine! c, 

 genital pore ; d, anus. 2, cephalic extremity of the male ; a, mouth ; b, oeso- 

 phagus. 3, caudal extremity of the male ; a, cup ; b, penis. 4, egg. 



kidneys of the horse and the dog, and sometimes in 

 man. It partly destroys this organ, and has been seen 

 a metre in length. The Strongylus commutatus often 

 lives in great abundance in the lungs of the hare, and 

 the Strongylus filaria in the lungs of the sheep, occa- 

 sionally in such great numbers that their presence 

 produces pneumonia. 



Porpoises generally have strongyli in their lungs and 

 their bronchia, and they are seen by thousands in the 

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