32 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



84,u long, according to Monnig; Horst figures what is evidently a 

 telamon partly encircling the cloaca near its aperture. Testis closely 

 wound about anterior portion of intestine. 



Female 17 to 23 mm, long by 560 to 700/* wide. Esophagus length 

 14 of body length. Lateral cervical papillae 960/* from anterior end, 

 excretory pore 800/*, nerve ring 660/*. Vulva (fig. 32) 250/* anterior 

 to anus. Anus 572/* from tip of tail; tail ends in a mucronate tip 

 128/* long. Cuticula around vulva often inflated and may form 

 a considerable protrusion. Vagina 120/x long. Ovejectors parallel, 

 the cuticular portions 620/* long and the musculo-epithelial portions 

 1.5 mm. long. Eggs oval, 63/* by 35/x. 



Life history. — Unknown; probably simple and direct. 



D istribution. — Africa. 



Figs. 31-32. — Codiostomum struthionis. 31, Male bursa, lateral view. 32. 

 Female tail. After Monnig, 1923 



Genus DELETROCEPHALUS Diesing, 1851 



Generic diagnosis. — Deletrocephaleae (p. 30) : No corona radiata 

 present, the mouth aperture bounded by 6 equal or subequal papillate 

 lips. Buccal capsule provided with meridial ribs or rays and with 

 teeth in some species. Bursa with characters of the tribe ; one branch 

 of the dorsal ray sometimes very slender. Spicules slender and equal. 

 Vulva and anus close together. Ovejectors parallel. 



Type species. — Deletrocephalus dimidiatus Diesing, 1851. 



DELETROCEPHALUS DIMIDIATUS Diesing, 1851 



Synonym. — Sclerostomy dimidiatum (Diesing, 1851) Stossich 

 1899. 



Host. — Rhea americana. 



Location. — Ceca and large intestine, especially at union with small 

 intestine. 



Morphology. — Deletrocephalus (p. 32) : Head (fig. 33) compressed 

 lnterally, the elliptical buccal aperture with its long axis dorso-ven- 



