— 134 — 



15. Oxyuris praeputialis nova spec. 



This new species was found in tlie intestine of a represen- 

 tative of tlie family Bufonidae {Biifo A^2 10). 



There were no males at my disposal. The body of the 

 females examined is white, of acylindrical form with a slightly 

 attenuated anterior extremity; the posterior extremity is pro- 

 vided with a small flagellated caudal process. The cuticle is 

 very finely striated transversely, this striation being visible 

 only at high magnification. On the cephalic end the cuticle 

 forms a fold which embraces the anterior portion of the pa- 

 rasite similarly to the praeputium. The cephalic extremity 

 was in some specimens uncovered, whilst in the others it 

 was covered on the sides by the praeputial fold out of which 

 only the anterior edge of the lips was to be seen. The mouth 

 opening is surrounded by 3 elongated lips of equal size each 

 of which is provided with 2 fairly large papillae. In the spe- 

 cimens the head of which was not covered with the praepu> 

 tium the former protruded at a distance of 0,05 mm. behind 

 which the point of attachment of the praeputial fold was 

 marked in the form of a ring. 



The length of the females examined varied between 

 3,0 — 4,5 mm. The width of the body in the region of the 

 oesophageal bulb reached 0,2 — 0,25 mm., in the region of the 

 genital aperture — 0,288 — 0,275 mm., on the level of the 

 anus=0,153 — 0,17 mm. The entire length of the oesophagus= 

 0,51 — 0,55 mm., the width of the cylindrical portion being 

 0,05 — 0,06 mm., the diameter of the bulb — 0,136 — 0,15 mm. 

 The latter is provided with a threevalved chitinous apparatus. 

 On the level, where the cylindrical portion of the oesophagus 

 passes into the bulb, or somewhat anteriorly, is situated the 

 excretory pore. The intestine which is about as Avide as the 

 bulb, or a little wider, terminates by the anus at a distance 

 of 0,37 — 0,4 mm. from the caudal end. The posterior part of 

 the body is provided with a flagellated pointed appendix, 

 0,28 — 0,32 mm. long, and composing about '/lo — '4 part of 

 the entire length of the body. 



The genital aperture is situated nearly in the middle of the 

 body being slightly displaced forwards: thus in a female 4,5 mm. 

 long the genital aperture is situated at a distance of 2,20 mm. 

 from the cephalic end and 2,30 mm. from the caudal. 



