NEMATODE PARASITES OF BIRDS 



149 



Female 24 to 46 mm. long by 1 to 1.8 mm. wide. Tail conical, anus 

 about 400/x from caudal end in a specimen of median size. Vulva 

 in anterior third of body, dividing body length in ratio of 5 :13. 

 Ovejector ( % ) filiform and sinuous for a length of 8 to 10 mm., then 

 enlarging and dividing into the 2 uteri. Eggs spherical, 50 to 52/* 

 in diameter, according to Dujardin, 72/i in outer diameter and 

 42/a as diameter of the yolk, according to Linstow. The latter author 

 describes the shell as 4.9/x thick and covered with uniformly distri- 

 buted, shining elevations. 



Life history. — Unknown. 



Distribution. — Europe (Baltic Sea), South America (Brazil), Af- 

 rica (Nubia and Egypt), Asia (India), Australia and North Amer- 

 ica (Mexico and United States (Yellowstone Lake, Wyoming)). 



FlG. 218. OoNTHACABrUM ANDKKSOXI. a, DOESAL LIP/ b. [nterlabium; c, vulva; 



d, MALE TAIL. AFTBR VEVEKS, 1923 



CONTRACAECUM ANDERSONI Vevers. 1923 



Host. — Florida caerulea. 



Location. — Small intestine. 



Morphology. — Contracaecum (p. 146) : Cuticle transversely stri- 

 ated. Head 400//. wide by lOO/i long. Three fleshy lips and 3 

 large interlabia; the former (fig. 218#) each bear 2 papillae; the in- 

 terlabia (fig. 2186) are triangular, 150/* long. Esophagus 3.75 mm. 

 long; posteriorly directed appendix 750/* long by 150/* wide. An- 

 teriorly directed cecum 2.75 mm. long. 



Male 15 to 17 mm. long by 350/t wide. Cloacal aperture 85/t 

 from posterior end. Five pairs of postanal papillae (fig. 218r/), the 

 most anterior pair being double; 5 pairs of adanal, and 20 to 25 

 pairs of preanal papillae. Spicules equal, 1 mm. long by 10/i wide. 



Femiale 19 to 22 mm. long by 750/* wide. Anus 130/* from 

 caudal end which is conical and sharply tapering. Vulva (fig. 218c) 

 just anterior to middle of body, 9.5 mm. from head end in a 20 

 mm. specimen. Vagina short (150/«), muscular, with 3 pairs of 



