384 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



mouth opening small, circular. Buccal capsule broad (12//,) and very 

 short, without teeth. Esophagus 800/* to 930/* long. Anus 70/* to 

 110/* from posterior end; body narrows suddenly behind anus, as in 

 Epomidiostomum. Vulva 1.7 to 1.75 mm. from posterior end. Com- 

 bined length of ovejectors (including sphincters) about 325/*; uteri 

 divergent. Eggs 57/* to 69//. long by 37// to 42// wide. 



EPOMIDIOSTOMUM QUERQUETULAE Boulenger, 1926 



Boulenger 15 also describes this species from stomach wall of Quer- 

 quedula crecca {=Nettion crecca) ; Egypt. 



Morphology. — E pamidiostomum (p. 26) : Body slender, of yellow- 

 ish color. Head very small, provided laterally with a pair of cuticu- 

 lar expansions, corresponding to, though less developed than, the 

 "epaulettes" of the type species (E. unclnatum) . Mouth with 

 six (four submedian, two lateral) papillae. Mouth cavity funnel 

 shaped; esophagus elongated, club shaped. Cuticle with conspicu- 

 ous cross striations, highly developed in cervical region into folds. 

 Male 8.8 to 10.5 mm. long by 180// to 200// in diameter. Head only 

 35// in diameter; esophagus, 1 to 1.05 mm. long. Bursa trilobed; 

 dorsal lobe very small. Dorsal ray divided at distal end into four 

 very small branches. Externo-dorsal rays short and thick; lateral 

 rays of approximately equal size. Genital cone well developed and 

 provided with a pair of conspicuous papillae at its apex, as in type 

 species. Spicules 180//, to 200// long, the distal portion divided into 

 two unequal branches. Gubernaculum absent. Female 13 to 14.5 

 mm. long by 220//. wide. Head 38// in diameter; esophagus 1 to 

 1.1 mm. long. Anus 130// from posterior end of body; diameter of 

 body sharply diminished posterior to anus. Vulva a transverse slit 

 on slight elevation, 2.7 to 3.2 mm. from posterior end. Ovejector, 

 including sphincter, 460/* long. Eggs 80// to 90/* long by 50// wide. 



This species, as described by Boulenger, is very similar to Epo- 

 midiostomum orispinurn from the same host, tc which species Bou- 

 lenger makes no reference. Since, however, the descriptions differ 

 in the two cases with reference to the number of branches of the 

 spicules and with reference to the head, and since there is no illus- 

 tration of the head of E. orispinurn to compare with that of E. quer- 

 quetulae, the latter must be considered a distinct species. 



EPOMIDIOSTOMUM SKRJABINI Petrow, 1926 



Petrow 1G reports this species from Anser anser domestieus and 

 Anser albifrons; Don district, Russia. 



Morphology. — Epomidiostomum (p. 26) : Male 9.5 to 11.5 mm. 

 long by 210/* to 240// wide. Esophagus 1.02 mm. long. Spicules 



15 1926 : Parasitology, vol. 18, pp. 91, 92, figs. 8-10. 



16 1926 : Trudy gossudarstvennogo instituta eksperimentalnoi veterinaril ; Moskow, vol. 

 3 (1), pp. 103-105; 4 figs. 



