1922.] 



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



329 



ol mm. 



Fig. 65. — Spiroxys annulata. 

 male ; lateral view. 

 c, cuticular collar. 



Head of fe- 



0*025 mm. apart), forming a series of rings with prominent posterior edges, so that in 

 optical section the outline of the body has a rather saw-like appearance. 



There is a well-marked cuticular collar (seen also in S. gangetica) just behind 

 the base of the lips (fig. 65, c). 



The tail is unusually short (about 0*2 

 mm.) in both sexes. The length of the oeso- 

 phagus (measured from the anterior extremity 

 of the lips) is 2'8~3 - 5 mm. Except for a short 

 portion at the anterior end, which is purely 

 muscular, its walls contain many pocket-like 

 glands arranged in several linear series. The 

 cervical papillae, which are prominent and 

 resemble small, backwardly-directed spines, 

 are situated at a little over 1 mm. from the 

 anterior end. The nerve-ring is at o62-o*65 

 mm., and the excretory pore at 0'8 mm., from 

 the anterior end. 



The inflation of the caudal alae in the 

 male is very pronounced. As usual in the 

 genus, they are joined anteriorly by an inflated 

 cushion of cuticle which passes over the 



ventral surface in front of the cloaca. There is also a sucker-like preanal depres- 

 sion, produced by the well-developed caudal muscles, within the bursa-like area 

 thus marked out. There is nothing worthy of special notice in the caudal papillae, 

 which are present to the usual number (11 pairs) and arranged as in the other 

 members of the genus. The lateral papillae are, as usual deeply buried in the 

 inflated alae. The small pre- and poste loacal pairs are sessile. The spicules are 

 nearly equal in length (from 16 to 2*3 mm.), slender, cylindrical and finely pointed. 



The tail of the female is sharply conical, with the tip bent ventrally. The 

 caudal papillae are at 0*17 mm. from the tip. The vulva is situated slightly behind 

 the middle of the body, at 13-8-15-5 mm. from the posterior extremity. The muscu- 

 lar vagina is very narrow, running forward from the vulva. The ova have a very 

 thin, membranous shell, measuring about 0-075x0-06 mm. 



Subfamily GNATHOSTOMINAE, Baylis and Lane, 1920. 

 Genus Tanqua, R. Blanchard, 1904. 

 Tanqua tiara (v. Linst., 1879). 

 This common form occurred in great abundance in monitors of the following 



species : — 



Varanus salvator, 

 V. flavescens, 

 V. nebulosus, 

 V. bengahnsis. 



