166 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



the body the striations are very prominent and produce the appear- 

 ance of the body being crenated. Head (figs. 237# and b and 238a) 

 elaborate; 2 lateral lips, large and semilunar at the wide anterior 

 edge, and 2 small interlabial median lobes. Each of the lateral lips 

 has 3 teeth on its inner surface. 



Male 15 to 20 mm. long by 500 to 550/x wide. Cloacal aperture 

 1/22 of total length from posterior end. Caudal region (fig. 237c), 

 recurved toward the ventral face, sometimes even twisted in a spiral ; 

 caudal alae wide, longitudinally striated. Six pairs of pedunculated 

 papillae, of which 4 are preanal, 2 postanal. Spicules unequal, the 

 one 2.6 to 3.3 mm. long, slender and pointed, the other only 310/x. 

 (Linstow) or 180/x long (Railliet and Henry), thick and ending 

 in a hook with rounded point (fig. 238c). 



Figs. 237-238. — Spikura uncinipenis. 237, a, Lateral view ; b, front view of 

 head; e, male tail. After Drasche, 1884. 238, a, Head; 6, egg; c, free end 



OF SHORT SPICULE. AFTER L.INSTOW, 1899 



Female 18 to 26 mm. long by 700 to 800/x wide. Tail 1/100 

 total length. Vulva almost at middle of body, salient. Eggs (fig. 

 2386) 43 to 47/x long by 26/z wide, embryonated; shell thick, rein- 

 forced at each pole. 



Life history. — Unknown; probably involving an insect as inter- 

 mediate host, as larvae of Sjnrura gastrophila have been found 

 encysted in cockroaches. 



Distribution. — South America (Brazil) and Europe (France 

 (Melun)). 



Genus CYRNEA Seurat, 1914c 



Generic diagnosis. — Spirurinae (p. 164) : Mouth with 4 lips. No 

 lateral alae. Sensory papillae far posterior to nerve ring. Male 

 with 2 unequal spicules; a gorgeret present, Female with vulva 

 usually situated considerably posterior to middle of body. Ovejec- 

 tor with vestibule differentiated into an organ for storage of eggs. 

 Uteri parallel. 



