Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . intedtail end, cuticle smooth; mouth simple with four lips; long, slender, cylin-drical esophagus reaching one-fourth of the length of the worm; anus close ^ See Beisele, Munch, med. Wchnschr., 1911, LMII, 2391; Flury, Arch. f. exper. Path. , 1913, LXVII, 294. 2 See CroweU and Hammack, Philippine Jour. Sc, 1913, VIII (B), 157; Willets, Ibid.,1914, IX, 233; Fracker, Jour. ParasitoL, 1914, I, 22; Aschoff, Berl. klin. Wchnschr., 1914) LI,1504. 148 DIAGNOSTIC METHODS. to tail;
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . intedtail end, cuticle smooth; mouth simple with four lips; long, slender, cylin-drical esophagus reaching one-fourth of the length of the worm; anus close ^ See Beisele, Munch, med. Wchnschr., 1911, LMII, 2391; Flury, Arch. f. exper. Path. , 1913, LXVII, 294. 2 See CroweU and Hammack, Philippine Jour. Sc, 1913, VIII (B), 157; Willets, Ibid.,1914, IX, 233; Fracker, Jour. ParasitoL, 1914, I, 22; Aschoff, Berl. klin. Wchnschr., 1914) LI,1504. 148 DIAGNOSTIC METHODS. to tail; vulva at posterior third, containing yellowish-green oval ova, 50 to 58microns long and 30 to 34 microns broad. The larvae develop in the intestineand are passed in the fecal material. These larvae are at first from 200 to240 microns in length, but increase to two or three times this length. Thelarvae dififer essentially from the parent in having a rhabditiform the discharged feces at about 30° C. these develop with one moulting ofthe cuticle to a free-living generation with separate Fig. 43.—Strongyloides intestinalis; on the left, a gravid female from human intestine(natural size mm.). In the middle, a rhabditiform larva from fresh fecal matter, X 120;to the right, a filariform larva from culture, X 120. {Tyson after Braun.) In this free sexual generation the worms are smooth, cylindrical, andtapering, with pointed tail-ends; the mouth is the same as in the parasiticform; esophagus rhabditiform with its anterior portion long and with the pos-terior pyriform and containing a Y-shaped chitinous armature; anus at baseof tail; male with tail curved and two spicules, body length mm.; femaleI mm. long, with straight pointed tail, vulva a little back of the middle; ovafew, yellowish, ellipsoid, thin-shelled, 70 by 45 microns in size, sometimeshatching in the uterus. The larvae of this generation look much as their THE FECES. 149 free parents, are at f
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