274 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



and remount along the lateral fields, their anastomosis, when present, 

 occurring a short distance from the cephalic extremity ; anastomosis 

 variable, not occurring in many of the males examined by Seurat and 

 occurring in 1 female only on 1 side and not on the other. Tricuspid 

 papillae at some distance posterior to cordons. 



Male 13.5 mm. long by 290/a wide. Cordons 395/* long. Tri- 

 cuspid papillae 445/* and 468/* from head end. Tail 360/* long, 

 slender. Caudal alae narrow, triangular, and pointed at the extrem- 

 ity, whereas those of S. laticeps are wide and rounded at the extrem- 

 ity. Four pairs of preanal and 5 pairs of postanal papillae. Right 

 spicule 156/* long, the left 372/* long. 



Female 11.2 to 27.5 mm. long by 300 to 612/* wide. Cordons 660/* 

 long in worm 19.3 mm. long; tricuspid papillae 410/* and 696/*, and 



Fig. 337. — Stnhimantus affinis. a, Female genitalia. After Seurat, 1915. 

 ft, Head end. After Seurat, 1916 



vulva 9 mm. from anterior end in same specimen. Vulva (fig. 337a) 

 very small, not projecting, situated directly in front of middle of 

 body. Ovejector directed posteriorly, 420/* long, the cuticular ove- 

 jector 210/* long. Eggs 38/* by 28/*, thick-shelled, embryonated when 

 deposited. 



Life history. — Unknown ; probably involves intermediate stages in 

 other hosts. 



Distribution. — Europe and Africa (Algeria). 



SYNHIMANTUS BREVICAUDATA (Dujardin. 1845) Gedoelst, 1919 



Synonyms. — Dispharagus brevicaudatus Dujardin, 1845; Spirop- 

 tera triaenophora Mehlis in Creplin, 1846; Strongylus ardeae-stel- 

 laris Rudolphi, 1819, nomen nudum; Histiocephalus brevicaudatus 

 (Dujardin, 1845) Diesing, 1851. 



Hosts. — Primary : Ardea stellaris, Botaurus stellaris, Ardetta 

 minuta; secondary : Unknown. 



Location. — Stomach (apparently the gizzard). 



Morphology. — Synhimantus (p. 272) : Body filiform. Head 25 to 

 35/* wide, with 2 conical projecting lips. Cordons (fig. 338a) 

 transversely striated, extending posteriorly for 230 to 300/*, then 

 recurrent and anastomosing. Cervical papillae tricuspid, 60/* pos- 



