i66 Records of the Indian Museum. [Voi,. X, 



The cuticle of the head is not ringed, that of the body shows 

 annulation, but this is probably artificial as the rings are com- 

 pletely irregular in breadth. 



Lateral membranes extend from the head to the base of the 

 tail, but it has not been found possible to measure them. 



A large ventral pore (fig. i, v. p.) lies in the midline opposite 

 the oesophageal bulb^ •323 mm, from head and opens into a wide 

 sac. 



The vulva is transverse, mid ventral, without prominent lips 

 and lies somewhat nearer the head than the tail (fig. i, v.). 



The anus also has no prominent lips and lies in the midven- 

 tral line. 



Behind the anus, the tail (fig. 2) narrows rapidly and then 

 again more gradually, forming a sharp spine. 



The body wall is of the meromyarian type. The lateral lines 

 measure "039 mm. in breadth shortly behind the oesophageal bulb. 



Internal organisation. — Oesophagus. The anterior extremity is 

 slightly thickened, but the greater length of the organ is cylindrical 

 and of uniform calibre. It moves and bends with the retraction or 

 protraction of the head. 



The anterior portion of the oesophagus, •0187 mm. in length, 

 is marked off by a transverse diaphragm of closely set muscle 

 fibres, corresponding to the pharynx described by Dujardin in 

 Heterakis hrevicaudata. 



The lumen of the oesophagus is of the usual triradiate form 

 with a tubular dilatation at the outer end of each radius such as 

 also occurs in Oxysoma kachugae, mihi, and which is described b}^ 

 Schneider (9) in Asc. jerox, Ehrbg. At its posterior extremity it 

 expands to form the chestnut-shaped bulb, which possesses a 

 triradiate lumen, the inwardly projecting angles of which are 

 armed with chitin. 



The bulb is succeeded by a pear-shaped dilatation of the 

 intestine, but behind this the intestine is compressed by the repro- 

 ductive organs. 



Males (fig, 4) are relatively infrequent. Only three specimens 

 were found among a large number of females. They measure "gg- 

 1*07 mm. in length; relatively more stout than the females. 



The head probably has the same structure as in the female, 

 but the three membranous lips have not been observed by the 

 present writer. The three teeth arising from the anterior end of 

 the oesophagus are distinct. The head can be withdrawn. The 

 anterior portion of the oesophagus is marked off by a diaphragm. 

 Lateral lines extend from head to anus. Ventral pore as in female. 



The cuticle of the body is transversely striated. The striae 

 measuring "0017 mm. in breadth. The head and tail are un- 

 striated. 



The anogenital aperture (figs. 7 and 8) is enclosed in front and 

 at the sides by a fine bursal membrane, which is supported on each 

 side by three papillae shaped like delicate nine pins. A row of 

 three additional papillae lies in front of the bursa on either side. 



