NEMATODE PARASITES OF BIRDS 



329 



of its length and 24 to 30/* wide at the base; short spicule 180 to 

 240/* long by 27 to 42/* wide. 



Female 13.5 to 20 mm. long by 270 to 390/* wide. Anus 390 to 

 440/* from tip of tail (fig. 394). Vulva 780/* to 1.07 mm. from tip 

 of tail. Vagina 2.64 mm. long (judging from the figures this in- 

 cludes more than the vagina) ; it is dilated at a point 660/* from 

 the vulva to form a thin-walled portion holding about 10 eggs 

 in transverse rows; not more than 1 egg at any point in terminal 

 portion. Eggs 33 to 45/* by 25 to 30/*, rather square-ended, con- 

 taining embryos when oviposited. 



Life history. — Unknown. See remarks on O. mamoni, p. 326. 



Figs. 392-393. — 392, Oxyspirura ophthalmica. a, Head; b, male tail. After 

 Linstow, 1903. 393, Oxyspirura paevovum. a. Head; b, male tail. After 

 Sweet, 1910 



Distribution. — Australia. The worms reported by Smit from the 

 Dutch Indies have egg measurements in agreement with this species, 

 40/i by 20/*; he calls them O. mansoni, but they differ in some re- 

 spects from both O. marisoni and O. parvovum. 



OXYSPIRURA SIAMENSIS (Linstow. 1903) Ransom, 1904 



Synonym. — (Jheilospirura siamensis Linstow, 1903*7. 



Hosts. — Primary: Gentropus siamensis {=Centropus sinensis)', 

 secondary : Unknown. 



Location. — Probably the eye, according to Linstow. 



Morphology. — Oxysjrirura (p. 321) : Cuticula with fine transverse 

 striations. Buccal cavity small. 



Male 8.9 mm. long by 260/* wide. Esophagus 1/11, tail 1/34, of 

 body length, the tail (fig. 395) curved ventrally. About 28 pairs of 

 preanal papillae, becoming gradually smaller anteriorly. Spicules 

 unequal, 470/* and 250/* long. 



Female 9.8 mm. long by 460/* wide. Esophagus 1/13, tail 1/37, of 

 body length. Vulva 620/* from tail end, situated a short distance 

 anterior to anus. Vagina directed anteriorly, 260it long, dividing 

 into 2 uteri. 



