1922.] 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



287 



papillae. The postanal papillse are arranged in five pairs, of which the most posterior 

 is lateral, the rest ventral. The two anterior pairs are at almost the same transverse 

 level, just opposite to the posterior lip of the cloaca. 



The tail of the female is 0*23 mm. in length. No caudal papillae were seen. 

 The vulva is situated a little behind the anterior fifth of the body (at 4*3 mm. from 

 the anterior end). The simple muscular vagina, after a preliminary coil anteriorly, 

 pursues a very irregular course posteriorly to about 15 mm. from the vulva before 

 the origin of the uterine branches. These are about 8 mm. in length, their posterior 

 ends serving as receptacula seminis. The ovarian tubes appear to double upon them- 

 selves some distance in front of the anus, and return towards the anterior end. The 

 ova are nearly spherical, with a thick shell measuring 0*0575-0*0725 mm. in 

 diameter. 



Genus Amplicaecum, Baylis, 1920. 

 Amplicaecum varani, sp. nov. 



(Figs. 23, 24.) 



A few specimens of an Ascarid which appears to belong to the genus Amplicaecum 

 were collected on one occasion from the intestine of Varanus salvator in the Zoologi- 

 cal Garden. The only Ascarid hitherto recorded in Varanus, L so far as we are able 

 to discover, is Ophidascaris filaria, which 

 is, however, usually found in pythons. 

 This is a much larger species, and could 

 not be confused with the present form. 



There were several adult males, but 

 unfortunately only one fully mature 

 female. The measurements in the fol- 

 lowing description were taken from this 

 female and the three largest males. 



The male measures 22 '2-24*9 mm. m 

 length j the female 2475 mm. The great- 

 est thickness is 073 mm. in the male, o*8 

 mm. in the female. The diameter of 

 the head is 0*25-0 "29 mm. The cuticular 

 striations are fine (about 0*005 mm. 

 apart). The lips (fig. 23) are nearly square in shape, and have a deep indentation 

 on the inner surface at the anterior margin. The interlabia are very small and almost 

 hidden by the lips. From the interlabia well-marked semicircular grooves in the cuticle 

 run round the bases of the lips, nearly meeting in the median line of each lip. These 

 grooves have upstanding membranous cuticular borders posteriorly. The dorsal lip has 

 two moderately large papillse. Each ventro-lateral lip has one large, lozenge-shaped 

 papilla towards the ventral side, and one very small papilla laterally. The dentiger- 



Fig. 23. — Amplicaecum varani. Head of female 

 dorsal view. 



dr., dentigerous ridge; g., grove in cuticle; i. 

 interlabium ; p., papilla. 



See Baylia (1921). 



