28 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



and almost parallel to the main trunk which bifurcates to form the 

 medio-lateral and postero-lateral rays; the externo-dorsal rays arise 

 at the base of the dorsal ray and are short, with a swelling project- 

 ing near their union with the dorsal ray; the dorsal ray bifurcates, 

 each branch in turn apparently bifurcating at its tip. There are a 

 pair of large caudal papillae near the base of the dorsal ray. Two 

 equal spicules, brown, 120 to 130/* long, divide to form 3 terminations 

 posteriorly. No gubernaculum. 



Female 10 to 11.5 mm. long by 250// wide. Tail (fig. 26) forms a 

 conical appendix 140 to 170//, long, with a button at its apex. The 

 vagina is a transverse cleft, 110/* long, situated 2.2 mm. from the tip 

 of the tail. Eggs elliptical, 74 to 80/* long by 48 to 50/* wide. 



Life history. — Unknown. 



Figs. 24-27. — 24, Epomidiostomum uncinatum. Anterior end. 25, Same. Male 

 bursa. 26, Same. Female tail. Nos. 24-26 after Skrjabin, 1916. 27, Epo- 

 midiostomum orispinum. male bursa. after molin, 1861 



Distribution. — Europe (Sweden), Central Asia (Province of Syr- 

 Daria), and Africa (Algeria (Ain-Mokra) ). 



EPOMIDIOSTOMUM ORISPINUM (Molin. 1861) Seurat, 1918 



Synonyms. — Strongylus anseris Zeder, 1800, in part; Strongylus 

 orispinus Molin, 1861. 



Hosts. — Anas albifrons, A. anser domestica, A. anser fera, A. 

 clangula, A. crecca, A. fuligula, A. fusca, A. leucops, A. mollissima, 

 A. nigra, A. penelope, A. segetum, Anser anser, Fulica atra. 



Location. — Under the mucosa of the esophagus and proventriculus. 



Morphology. — Epomidiostomum (p. 26) : Body robust, slender in 

 head region, transversely striated. Head distinct, with a pair of 

 large sessile lateral papillae and festoons on each side, and with 2 

 dorsal and 2 ventral hook-like nodules (lips or papillae), directed 

 posteriorly. 



