—130 — 



13. Oxyiiris myriapodicola n. sp. 



At my disposal there were only females taken from the 

 intestine of Polydesmus sp. 



The body was 2,48 mm. long, at a maximum width 0,187 mm. 

 on the level of the genital aperture. In the region of the 

 hinder portion of the oesophagus the body reached 0,153 mm. 

 in width, on the level of the anus — 0,1 mm. 



The cuticle is quite transparent, annular. Anteriorly to the 

 oesophageal bulb the body narrows, as well as posteriorly, to 

 the point, where the midgut passes into the slitlike rectum. 

 Posteriorly to the anal aperture begins the elastic, rather 

 massive, smooth caudal process pointed on the apex and 

 reaching 0,4 mm. in length (about Ve of the entire body-length). 



The first ring of the body is modified into the buccal 

 organ, being provided on its anterior edge with 6 small lobes 

 which play the role of lips. The round mouth-opening leads 

 into a sharply marked out oral capsule of cylindrical shape 

 with a slightly expanded posterior portion. The chitinized la- 

 teral walls of the capsule shoAV a high refraction of ligh 

 when examined under the microscope. The bottom of the 

 oral capsule extends to about the level of half the length Of 

 the second body ring which is longer than the succeeding 

 rings. The oral capsule seems to be pressed into the muscu- 

 lar oesophagus which is considerably wider than the former. 

 The entire length of the oesophagus together with its bulb- 

 like dilatation reaches 0,442 mm., which makes about Vo — '/s 

 of the body-length. The width of the cylindrical part of the 

 oesophagus is 0,034 mm., the diameter of the bulb-like 

 dilatation = 0,068 mm. (length) and 0,085 mm. (width). 

 The initial part of the intestine is swelled so that its width 

 exceeds that of the bulb. The intestine terminates by a slit- 

 like anus situated somewhat anteriorly from the base of the 

 caudal process, at a distance of 0,5 mm. from the apex of 

 the tail. 



The excretory aperture is situated on the level of the an- 

 terior part of the oesophageal bulb. The vulva opens nearly 

 in the middle of the body-length, at a distance of 1,25 mm. 

 from the cephalic end (and 1,23 mm. from the end of the 

 tail). The oval eggs reach 0,06 — 0,068 mm. in length at a 

 width of 0,045 mm. The vagina is directed forwards from the 



