— 136 — 



has its axis directed perpendicularly to tlie axis of the caudal 

 process. 



Thus, in the number of papillae (1 pair preanal, and 

 2 pairs postanal) our new species resembles Oxyuris laevicauda 

 Seurat 1914. The caudal process bears the character of an 

 elastic flagellum widened at the base and gradually attenua- 

 ting towards the apex. I did not succeed in finding any spi- 

 culum, notwithstanding the most careful examination; it is, 

 probably, so fine that to the observer it becomes lost in the 

 tissue of the surrounding organs. The excretory pore is situa- 

 ted at a distance of 0,187 mm. from the cephalic end. The 

 width of the body in the region of the anus reaches only 

 0,04 mm. 



The female of this species is much larger than the male 

 its length being 4 mm., and maximum width — 0,34 mm. The 

 length of the entire oesophagus is about 0,6 mm., the diame- 

 ter of the bulb=0,l7 mm. The excretory pore is at a distance 

 of 0,34 mm. from the cephalic end. The caudal extremity is 

 very elongated, reaching 1,054 mm. The genital aperture is 

 situated anteriorly to the middle of the body-length. The eggs 

 are of a very elongated oval shape, the dimensions being 

 0,17 mm. length, and 0,055 mm. — width. 



The mouth-opening of the parasite is round, without cle- 

 arly expressed lips or formations analogous to them. There is 

 likewise even no trace of anything similar to the oral cap- 

 sule. 



In comparing our parasite with the other species of 

 Oxyuris, we are compelled to consider it as the nearest to 

 the species Oxyuris laevicauda Seurat 1914 and partly to 

 Oxyuris spinicaucla Dujardin 1845. There is no doubt that 

 the future investigator of the fam. Oxyuridae will separate 

 these three parasites into a new independent genus. 



17. Oxyuris spinicauda Dujardin 1845. 

 18. Oxyuris annulata Linst. 1899. 



To this species I refer the females taken from the hindgut 

 of lizard Ks. 6 (from fam. Scincidae). 



The body of the female, 5,44—5,5 mm. long, is of white 

 colour, of cylindrical form with attenuating anterior extremity^ 

 and in a smaller degree posterior extremity. The cuticle is 



