54 



queue obliquement tronque'e et comme onguicule'e, ou ter- 

 minee obliquement par un appendice de" prime", arque"; anus 

 pres de 1'extre'mite'; spicule simple, presque droit, tres-aigu, 

 long de 1.25 mm., large de 0.025 mm. pres de sa base, con- 

 tenu dans une gaine fibreuse et musculeuse qui le fait saillir 

 en se contractant, retractile au moyen de deux muscles 

 syme'triques insures a sa base. 



" Femelle longue de 7.5 mm. a 8.2 mm., large de 0.66 mm. 

 a 0.70 mm. ; queue droite, amincie peu a peu et termine'e en 

 point mousse; anus situe" a 0.25 mm. de 1'extre'mite'; vulve 

 saillante et boursoufle'e, situe"e au quart poste"rieur de la 

 longeur, a 1.5 mm. de 1'anus; uterus et oviductes replies et 

 comme pelotonnes au-dessus de la vulve; ceufs elliptiques 

 longs de 0.096 mm. a 0.1 mm., larges de 0.053 mm." 



Later, Schneider (Monographic der Nematoden, Berlin, 

 1866, p. 120) properly placed the worm in the genus Oxyuris 

 and from poorly preserved material described the female as 

 3.5 mm. in length and the male 2.3 mm. "Mund mit (?) 

 Lippen. (Esophagus mit einem Bulbus, darin ein Zahn- 

 apparat Bursa wie ein Fingernagel gestaltet. Afterende 

 kegelformig weit nach hinten vorragend. Spiculum sehr lang. 

 Papillen ?" Schneider gives a plate of the tail of the male 

 (Taf. VII, Fig. 9), which we have reproduced in outline 

 (Fig. 9). 



In 1905, Dr. C. Y. White, then pathologist to the Phila- 

 delphia Zoological Gardens, referred about 200 small nema- 

 todes, of which only 6 were males, which he had obtained at 

 autopsy from the large intestine of an Iguana tuberculata, 

 to the senior writer for identification. They followed 

 closely the description of Dujardin, save that the ova were 

 larger (118 x 53 to 133 x 68 microm.) and ellipsoidal rather 

 than elliptical; there were three nearly equal lips to the mouth 

 without apparent papillae, and with the mouth-opening appear- 

 ing triradiate between the lips instead of a vertical mouth 

 with two lateral lobes. As in Dujardin 's description, the 

 anus was subterminal in the female, tail did not terminate 



