NEMATODE PARASITES OF BIRDS 



13 



verging from it and the divergence emphasized at the tips, which 

 tend to recurve; the externo-dorsal ray is shorter than any of the 

 previous rays and is bent posteriorly near its middle ; the dorsal ray 

 is much shorter than the other rays, not extending half way to the 

 bursal margin; it bifurcates near its tip to form 2 short branches 

 which are deeply cleft, the internal branches of the cleft terminat- 

 ing in 2 short tips, and has a stumpy process on each side near its 

 base. The 2 spicules are 150 to 160^ long, somewhat curved and each 

 terminates in 3 pointed processes; the spicules are united by a mem- 

 brane to form a protrusible tube. The telamon (fig. 6) is 65 to 70/i 

 long, attached to the dorsal wall of the cloaca and has 2 longitudinal 

 processes extending backward and forward along the cloaca and 2 

 lateral processes forming a partial ring through which the spicules 

 protrude. 



Figs. 5-7. — Ornithostrongylus quadriradiatus. 5. Male bursa. G, 

 Telamon. 7, Tail of Female. All after Stevenson, 1004 



Female 18 to 24 mm. long. The vulva is 5 mm. from the end of 

 the tail. The short vagina is followed by 2 powerful muscular ove- 

 jectors. The tail (fig. 7) tapers to a narrow, blunt end, bearing a 

 short spine. The anus is 140^ from the end of the tail. Eggs 70 to 

 75//, long by 38 to 40/x wide, and apparently may be segmenting or 

 contain embryos when deposited. In normal saline eggs may hatch 

 in the uterus. , 



Larvae, first stage, 500/* long, with a blunt head, thick body and 

 slender, pointed tail. 



Life history. — Unknown ; probably simple and direct. 



Distribution. — United States and Australia. 



ORNITHOSTRONGYLUS FARIAI Travassos, 1914b 



Host. — Leptotila rufaxilla. 

 Location. — Intestine. 



Morphology. — Ornithostrongylus (p. 11) : Body red, with fine 

 transverse and longitudinal striations. Head with a dilated cuticle 



