Fig. 156. 



Postembryonic development. A-F — Camallanus sweeti (A — First 

 stage larva ; B — Anterior end. early second stage ; C — Early second 

 stage, posterior end ; D-E — Larva undergoing second moult, pos- 

 terior and anterior end. respectively ; F — Third stage larva, an- 

 terior end). G-I — Procamallanus fulvidraconis (G — 14 days old 

 larva ; H — Anterior end of larva, before first moult ; I — Larva 6 

 days old). J-Q — Dramnculw medinensis (J — Anterior end of first 

 stage larva; K — Posterior end of first stage larva; L — en face 

 view of first stage larva: M — Posterior end of first stage larva; 

 N — Cephalic region : O — Posterior end of normal larva undergoing 

 first moult; P — Normal third stage larva; Q — Tail of abnormal 

 third stage larval. R—Tetrameres craffli, third stage larva. S-T — 

 Longistriata musculi (S — Tail of preadult male: T — Tail of pre- 

 aduit male in final moult). U-V — Aclurostrongylus abstrusus, ? 

 second stage larva. W — Acanthocheilits rotunlatus. head ? third 

 or fourth stage larva. X-Y — Dermatoxys veUgera, head, fourth 

 stage. Z — Gongylonema pulchrum, tail third stage larva. AA-BB — 



Physocephnlus sexalatus (AA-Tail fourth stage male; BB-Tail of 

 third stage larva). CC— rAscarops strongylina, tail third stage. DD — 

 Spirura gastrophila. Tail male during fourth moult. EE-FF — 

 Heurocyrnea colini, tail third stage. GG-HH — Cheilospirura hamulosa, 

 third stage, tail and head. A-F, after Moorthy, 193S, J. Parasit., v. 

 24 (4) G-I. after Li. 1935, J. Parasit. v. 21 (2). J-Q. after 

 Moorthy, 193S, Amer. J. Hyg. v. 27 (2). R, after Swales, 1936. 

 Canad J Res Sec. D.. v. 14. S-T, after Schwartz & Alicata. 1935, 

 3 Wash. Acad. Sc., v. 25 (3). U-V, after Cameron, 1927, J. 

 Helminth, v. 5 (2). W, after Wuelker. in Wuelker and Stekhoven. 

 1933 Die Tierw. Nord-U. Ostsee. v. 5a. X, after Dikmans, 1931. 

 Tr Amer. Micr. Soc. v. 50 (4). Y, after Wetzel, 1931., J. Parasit. 

 v 18 Z-BB-CC, after Alicata. 1935. U. S. D. A. Tech. Bull. 489. 

 AA, after Seurat, 1913. Compt. Rend. Soc. Biol.. Paris, v. 75. 

 DD after Seurat, 1914, Ninth Congres Internat. Zool. EE-HH, 

 after Cram, 1931, U. S. D. A. Tech. Bull. 227. 



228 



