. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 371 Male 28 to 35 mm. long; maximum width 630 to 800/*, width at an- terior end of body 168 to 190^., at posterior end (just anterior to bursal cup) 370 to 480 Esophagus to about 12 mm. long. Bursal cup 480 to 560/x long by 560 to 700/i. wide, trumpet-shaped (fig. 430 b and c) with a distinct, fairly deep incision on the ventral side. Female evidently imperfect; length not given. Maximum width mm., width at head end 240^; esophagus 12 mm. long. Life history.—Unknown; see E. tubifex, p. 367. Distributio
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 371 Male 28 to 35 mm. long; maximum width 630 to 800/*, width at an- terior end of body 168 to 190^., at posterior end (just anterior to bursal cup) 370 to 480 Esophagus to about 12 mm. long. Bursal cup 480 to 560/x long by 560 to 700/i. wide, trumpet-shaped (fig. 430 b and c) with a distinct, fairly deep incision on the ventral side. Female evidently imperfect; length not given. Maximum width mm., width at head end 240^; esophagus 12 mm. long. Life history.—Unknown; see E. tubifex, p. 367. Distribution.—Europe (Austria (Museum, Vienna)) and Asia (Russian Turkestan).. Fig. 431.—Eustrongylides ignc-tus. a, Head; b, female tail; c and d, male TAIL; e AND f, EGG. AFTER JAEGERSKIOLD, 1909 EUSTRONGYLIDES IGNOTUS Jaegerskiold. 1909 Synonyms.—Filana cystica Rudolphi, 1819; Agamonema cysticuni (Rudolphi, 1819) Diesing, 1851; Eustrongylus papillosus Diesing, 1851, part; Hystrichis papillosus Molin, 1861, part; Eustrongylus tubifex Schneider, 1866, part; Spiroptera bicolor Linstow, 1899. Hosts.—Primary: fAnMnga anhinga, Ardea cocoi, A. herodias, liotaurus pinnatus; secondary : Fish; larvae in Symbranchus laticau- datus and Galaxias scriba resemble this species, according to Jae- gerskiold, and Chapin has found the preadult stage of this species in Fundulus diaphanus. Location.—In fat around gizzard of primary host, in body cavity of secondary host. Morphology.—Eustrongylides (p. 367) : Body equally thick throughout. Head (fig. 431«) witli 12 papillae in 2 circles, those of the inner circle being larger and more conspicuous than those of the outer circle, which are low and wart-like. Mouth opening hexag- onal. Mouth cavity 100 to 160/a long. Male 36 mm. long; maximum width 1 to mm., width at head end 250^, at tail end (just anterior to bursal cup) 350 to 460/*.. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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