160 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



directed cecum 1.8 mm. long, extending to within 700> of head and 

 attaining a width of 400//,. Cuticle transversely striated. 



Male 15.3 mm. long by 900//, wide. Cloacal aperture 340//, from 

 caudal extremity, the latter ending in a digitiform process. Spicules 

 (fig. 234c) unequal in size but of similar shape, their lengths 3 mm. 

 and 2.7 mm., respectively, their width 90/x. Four pairs of papillae 

 near tail end (fig. 234a 7 ), 4 pairs about halfway from end to cloacal 

 aperture; in addition, starting somewhat posterior to the cloacal 

 aperture and running far anterior, on each side of body, is a double 

 row of papillae, 20 or more double pairs. 



Female 15 to 25 mm. long. Tail ending in digitiform process. 

 In a specimen 25 mm. long, anus 400//, from posterior end, vulva 4 

 mm. from head end. Eggs 100/x long by 60//. wide. 



Life history. — Unknown. 



Distribution. — Antarctic (in the southern Pacific (Campbell 

 Islands) ). 



CONTRACAECUM TRICUSPE (Gedoelst, 1916) Baylis 1920b 



Synonym. — Kathleena tricuspis Gedoelst, 1916. 



Hosts. — Ardea, species and Plotus inelano g aster. 



Location. — Proventriculus. 



Morphology. — Contracaecum (p. 146) : Color yellow-white. Cuticle 

 with cross-striations, producing directly posterior to the head deep 

 furrows or a shirred appearance. Three lips (fig. 235 b and c) and 

 3 interlabia of elaborate structure, the lateral surfaces of the former 

 notched, with a point of the interlabia fitting into them. Interlabia 

 with large base and slender body, ending in 3 points, an internal and 

 2 laterals. Dorsal lip with 2 simple papillae, latero-ventral lips each 

 with 1 double papilla. No lateral alae. Cervical papillae 700//. from 

 head end. Esophagus 3.8 mm. to 3.9 mm. long by 100 to 160/t wide, 

 with an appendix 1.6 to 2 mm. long by 190 to 225/x wide. Cecum 

 originating from intestine extends to the anterior fourth of the 

 esophagus. 



Male 13.8 mm. long by 785//, wide. Tail conical (fig. 235a), ending 

 in a pointed appendage, curved ventrally. Cloacal aperture 140//, 

 from posterior end. At least 56 pairs of caudal papillae arranged 

 as follows : 4 pairs near caudal end, 2 of them lateral, 2 ventral ; 2 

 pairs directly posterior to cloacal aperture; 1 pair of large adanal 

 papillae and a series of about 50 pairs of preanal papillae in 2 regu- 

 lar rows. Spicules equal, 4.6 mm. long, of similar construction to 

 those of C. microcepluihon. 



Female 12.1 to 17.5 mm. long by 960// to 1.28 mm. wide. Tail 

 conical, 1/39 of total length, the anus being 350 to 440// and 2 papillae 



