— 135 — 



None of the females investigated, contained any ripe eggs. 

 The genital organs filled nearly the whole body of the para- 

 site with their convolutions beginning from a level somewhat 

 behind the bulb and extending nearly to the base of the 

 caudal appendix. 



16. Oxyuris megalocerca nova spec. 



This minute and elegant parasite was found in the coecum 

 of lizard .Ns 4 (Geckonidae). 



In general characters this species resembles very much 

 the species Oxyuris laevicauda S curat 1914'), described last 

 year (from the intestine of African reptiles Acafifhodacfylus 

 blanci Doum., and Semens officinalis), although differing 

 from the latter in many small characters, and mainly in the 

 presence of alae which originate at the cephalic end of the 

 parasite and terminate on the level of the anus (in Oxyuris 

 laevicauda the alae are situated only in the posterior third of 

 the body). 



The males of this new species reached 1,02 — 1,5 mm. in 

 length, at a maximum width of 0,136 — 0,2 mm. The body 

 consists of two distinct parts: a spindle-shaped body, and an 

 extremely long, thin tail the length of which is in the ratio 

 of 3:4 to the „body"-length. The cuticle is finely striated trans- 

 versely, the distance between two striae being only 0,003 mm. 

 On the sides of the body are situated the wide wings which 

 commence nearly exactly on the cephalic end and extend to 

 the level of the anus. The oesophagus, 0,27 — 0,35 mm. long, 

 is provided in its posterior part with a bulb of a regular 

 spherical form, 0,065 — 0,085 mm. in diameter. In the centre 

 of the bulb is situated the chitinous apparatus consisting of 

 -3 valves with dentate edges. Posteriorly to the bulb the inte- 

 stine begins. It is very wide in the anterior part which gra- 

 dually narrows posteriorly terminating by the anal aperture 

 at a distance of 0,46 — 0,51 mm. from the tip of the caudal 

 process. 



Anteriorly to the anus are situated one pair of preanal 

 elongated papillae directed forwards, and arranged more vent- 

 rally than the two pairs of postanal papillae. Of the latter one 

 pair lying nearer to the opening of the cloaca is directed 

 backwards, the other pair which is further from the cloaca 



21* 



