I9I4-] ^- H- Stewart : Indian Heliiunthology, No. I. ly^ 



arranged in three series. On the other hand it resembles Dujar- 

 din's Heterakis in the following points ; (i) the two uterine branches 

 are opposed; (2) lateral membranes are present, (3) the tail of 

 the male bears a sucker and papillae. It cannot be included in 

 Dujardin's genus Dacnitis on account of the absence of the 

 characteristic anterior enlargement of the oesophagus. 



Schneider's 'Heterakis'' includes many genera. H. macronis 

 should be included in the same group as H. distans, R., a parasite 

 of Simia sabaea, which it resembles in the absence of lips and of a 

 chitinous ring in the sucker. This group is identical with 

 Heterakis, Acheilostomi of Railliet (18, p. 409) characterized by 

 ' bouche sans levres, deux spicules egaux assez courts, ventouse 

 sans anneau chitineux.' Railliet identifies Heterakis, Acheilostomi 

 with Stelmius of Dujardin and Subulura of Molin. The species at 

 present under consideration differs from Stelmius in the fact that 

 the vulva lies in the middle of the body length and not shortly in 

 front of the anus. 



4. Dacnitis callichroi, n, sp. 

 (PI. xxi, figs. 35-38.) 



Two females were found in the intestine of Callichrous macro- 

 phthalmus, Blyth, from Lucknow. Owing to contraction in the 

 preservative (Looss' fluid) the body wall has been thrown into 

 wrinkles to a considerable extent, which diminishes the value of 

 the measurements. 



They are moderately plump worms ; for measurements see 

 table IV, page 187. The region corresponding to the anterior two- 

 thirds of the oesophagus is narrower than the remainder of the body 

 (fig- 35)- The head (figs. 36 and ^j) is rounded. The mouth is of 

 the usual Dacnitis tj^pe, of elongated lozenge-shape, the long axis 

 lying in the sagittal plane, with its aperture directed forward and 

 to the dorsum. It is surrounded by the usual membranous collar 

 springing from a cuticular thickening resembling a wire frame. 

 Each side of the collar bears 32-36 longitudinal striae. There are 

 four cephalic papillae — two subdorsal, two subventral. The head 

 does not curve toward the dorsum, 



No lateral membranes. 



The cuticle is not striated in the anterior oesophageal region, 

 but is transversely striated from the posterior oesophageal region 

 backward. The striae are caused by fibrillae lying in the deeper 

 layer of the cuticle and encircling the body. Intervals between 

 the striae '002 mm. in the anterior half, '0012 mm. in the pos- 

 terior half of the body. 



The vulva is narrow and oval, not prominent, in the mid- 

 ventral line, y^^==— . 



The tail (fig. 38) is conical and pointed, and bears a prominent 

 papilla on either side, slightly behind the mid point between the 

 anus and tip of the tail. 



