Fig. 179. DEVELOPMENT Ob' STJi'OMiY LOI UKS AND h'HAJilJJAS 



A-L — Strongyloides ransomi (A-B — Direct cycle, A — First stage larva. 

 newly hatched; B — Larva in first molt; C-J — Indirect cycle: C — 

 First stage larva, newly hatched ; D — Larva in first molt ; E — Larva 

 in second molt ; F — Larva in third molt ; G — Larval female in fourth 

 molt, H — Fiist stage larva from free-living female, newly hatched; I — 

 Second stage larva, immediately after first molt; J — "Filariform" larva 

 undergoing second molt; K-Lr — Parasitic generation, K — Larva from 

 suiall intestine of pig about 4 days after percutaneous infection; L — 

 Larva fi om pig, showing early final molt) . M-0 — Rhabdios fulleborjii 

 (M — Free-living female with larva, the genital organs already destroyed: 

 N — Cuticular hull of female with only one filariform larva, 115 hr. old 

 culture; O — Filariform larva (Same as N) from which ruticle of fe- 



male has been carefully removed) . P-Q — Rhnhdia^ fuscovenosa (P — 

 Infective rhabditiform larva 72 hours after hatching from egg of para- 

 sitic generation; Q — Filariform larva (infective larva) from free-living 

 generation) . R — Parastrongyloides winckesi male, S-W — Rkabdias fua- 

 corenosa, direct development {S— Rhabditiform larva ; T — Ensheathed 

 infective larva; U — Anterior end ; V — Anterior end during third and 

 fourth molts; \V — Posterior end of same). A-L, after Lucker, J, T.. 

 1934, U. S. D. A. Bull. no. 437. M-0. after Travassos, L., 1926. 

 Arch. Schiffs. u. Tropen-Hyg. v. 30. P-Q. after Chu. T. C. 1936, J. 

 Parasit. v. 22 (2). R, after Morgan, D. O.. 1928, J. Helm. (6). 

 S-W, after Goodey. T., 1924, J. Helm. 2. 



270 



