1922.] 



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



273 



Ophidascaris naiae (Gedoelst, 1916). 



We refer tentatively to this species forms found in the intestine of a cobra (Naja 

 tripudians) and in the stomach and intestine of two kraits (Bungarus fasciatus). 

 Their determination is open to question, all being young and not yet full-sized, 

 although two of the females contain ova. Apart from measurements, they seem to 

 agree fairly well with Gedoelst's (1916) rather brief description. 



Genus Polydelphis, Duj., 1845. 



Polydelphis sewelli, sp. nov. 



(Figs. 6, 7.) 



Host: Montpellier snake (Coelopeltis monspessulana*) . Locality: Khan-Yunis, 

 Palestine, May, 1917. 



Some Ascarids collected from the "abdomen and lung" of the above-named 

 snake by Major R. B. S. Sewell prove to belong to the genus Polydelphis, and to 

 the section of that genus in which the uterus 

 has six branches. 1 The worms are relatively 

 slender and of almost uniform thickness 

 throughout. The male measures about 66 

 mm. in length and l'2 mm. in thickness, the 

 female 73 mm. and 1*4 mm. respectively. The 

 cuticular striations are exceedingly fine. The 

 diameter of the head is 0*3-034 mm. The 

 lips (fig. 6) are somewhat hexagonal in outline, 

 and slightly broader than long. Their anterior 

 and lateral borders are somewhat emarginate. 

 Marginal dentigerous ridges are present, and 

 the pulp of the lip has two well-developed 

 antler-like anterior lobes, each having two main 



divisions. The dorsal lip carries two simple lateral papillae, each ventro- lateral lip 

 one large ventral and one very small lateral papilla. The oesophagus is simple, 

 somewhat enlarged posteriorly, and measures about 5 mm. in length. There is, at 

 least in some individuals, an intestinal caecum, which may reach a length of about 

 o*6 mm., or majr be quite rudimentary and not more than 0-125 mm - long. A pair 

 of very small cervical papillae is present at about 1-4 mm. from the anterior end. 

 The nerve-ring is situated at o'7-o - 85 mm. from the same point. 



The tail, in both sexes, is very short and rounded, and terminates in a small 

 spike about 0*05 mm. long. 



In the male, the tail (fig. 7) measures 0-25 mm. in length. The spicules are 

 short, subequal and broadly alate. The right spicule measures 1*35 mm., the left 

 1 '4 mm., and the dorso- ventral diameter of each is about o - o6 mm. The preanal 



o-l tutw. 



Fig. 6. — Polydelphis sewelli. Dorsal lip of 

 female, viewed from exterior. 



a.l., anterior lobe of pulp; d.r., denti- 

 gerous ridge ; p., papilla. 



1 See Baylis (1921) 



