KHABDITOID PARASITES. 



97 



mencement, the young have the characteristics of the genus Bhabditis, 

 but lose them while yet in the maternal body ; after they have 

 attained a certain size, they cease to eat, and undergo further de- 

 velopment only after having found an opportunity of becoming trans- 

 ferred into the lung of a frog, and thus exchanging their former mode 

 of life for a parasitic one. 



The adaptation to the circumstances of parasitic life is much more 

 complete in these worms than is the case in Bhabditis appendim- 



FlG. 61.— Rhabditoid {oim oi Jlhaidoneina (Asem-is) nir/ro- 

 venosum. A . Male ; B. Female, with embryos in 

 various stages of development. 



Fig. 62. — Mature em- 

 liryo of RhahdoT\pma 

 myrovenosum. 



lata. When they reach the lungs of their host, the young parasites 



grow to a length of almost an inch, and possess scarcely the sKghtest 

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