LIFE HISTORY OF ASCARIS LUMBRICOIDES. 45 



Immature stages of a neniatodo resembliiio- and probably identical 

 ■with Ascaris anoura have been found in the lungs of a python, indi- 

 cating that this species, like Ascaris lunibricoides and Belascaris mar- 

 glnata^ migrates through the lungs, reaching, however^ a more ad- 

 vanced development before moving into the alimentary tract. 



The larvae of HarrwThchiis contortus ingested by guinea pigs can 

 be found in the lungs 2 days later, indicating the possibility" that 

 this species migrates through the lungs before finally establishing 

 itself in the alimentary tract. 



^Migration of the larvae througli the lungs is probably a common 

 occurrence in the life cycle of nematodes whose adult stage occurs in 

 the alimentary tract. 



Stewart's observations as to the migration of Ascm^is larvse through 

 the lungs have been confirmed, but his suggestion that rats and mice 

 act as intermediate hosts is not tenable. No intermediate host is 

 necessary, and human beings and pigs become infected with Ascaris 

 as a result of swallowing the eggs of the parasite, and not as a 

 result of swallowing food, water, or other substances that have been 

 contaminated by the feces of rats or mice. 



BIBLIOGRAPHY. 



COPEMAN, A. S. 



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DiESING, KaEL MoEITZ. 



1851. — Systema helminthum. v. 2, vi + 588 pp., 2 1. 8°. Vindobonae. 

 VON Dbasche, Richaed. 



1883. — Helminthologische Notizen <Verhandl. d. k. k. zool.-bot. Gesellsch. 

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 Epstein, Alois. 



1892. — Ueber die Uebertragung des menschlichen Spulwurms {Af<c(iris 

 htmbticoides) <Verhandl. d. Versamml. d. Gesellsch. f. Kinderh. 

 . . . deutsch. Naturf. u. Aertze, Wiesb. (1891), v. 9, pp. 1-16. 

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1912. — Graisse et glycogene dans le d§veloppement de I'oeuf de r.ls'rr/y/.s 

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1914. — Notes de parasitologie et de technique parasitologique <Centralbl. 

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