I9T4-1 F- H- Stewart : Indian Helminthology , No. I. 183 



narrows (figs. 69, 70) in a club-shaped manner to form the tail 

 which bears a thin appendix-like termination. This thin portion 

 of the tail is of almost uniform diameter, and is somewhat crooked 

 toward the ventral surface. 



Head (figs. 67, 68). Mouth wide, surrounded b}- six leaf-like 

 semicircular lips, each bearing a sharp flat spine-like process. 

 The lips are situated two in the lateral lines, two subdorsally, two 

 subventrally. They can be folded in over the mouth, closing it, 

 or extended to lie parallel with the length of the body. No setae 

 on head in either sex. 



Buccal cavity. Cylindrical, lined with stout chitinous mem- 

 brane. It contains three teeth — one large right subventral and 

 two smaller, one dorsal, one left lateral, the smaller teeth lie some- 

 what posterior to the large one, all three ia front of the middle of 

 the length of the buccal cavity 



The oesophagus (fig. 66) is muscular and club-shaped with a 

 small segment, also muscular, at its posterior extremity, distinctly 

 separated from the main mass. This small segment projects into 

 the lumen of the intestine. 



Nerve ring not very distinct, '0017 from anterior extremity. 

 The circumoesophageal ganglionic collar is well marked. Pore of 

 ventral gland (?) opposite nerve ring even in adult female. The 

 tail bears a few setae at its tip. 



Female. — Vulva at the mid point of the body-length. Gonad 

 tubes two — anterior and posterior, each bent on itself and divided 

 into ovary and uterus. 



Male. — There are a few hairs on the oesophageal region of the 

 body, and a row of 9-10 setae on either side of the anogenital 

 aperture (fig. 69). Two sabre-shaped spicules with a hollow 

 conical accessory piece are present. 



This species is closely allied to Oncholaimus fiiscus. Bast, (i) 

 from the English Channel and North Sea. It possesses in common 

 with the latter species (i) the head bearing six mobile lips, and (2) 

 the peculiar appendix-like termination of the tail. It differs from, 

 0. fuscus in size: ^ 2"4 mm. contrasted with 6'5 mm. in 0. 

 fuscus, 9 2*5 mm. contrasted with 7 mm. (De Man. 15). The 

 writer has not observed the tubular organ described b}' De Man in 

 0. fuscus. 



