- 131 — 



genital slit. The anterior limit of the ovary does not reach 

 the initial part of the intestine. 



With its buccal apparatus the parasite characterized above 

 resembles the species described by Leidy ^) in 1850 under 

 the name Thelastomum labiatiim (also from the intestine of 

 Polydesmus virginiensis) in which the „oral annulus is infla- 

 ted, six lobed at the margin". However, in other characters 

 these species differ from each other to such an extent (e. g- 

 the caudal portion of the female in our species forms Ve of 

 the body-length, whilst in Thelastomum labiatum it is ^/2) 

 that the specific independence of each is doubtless. On the 

 other hand, our parasite resembles Oxyuris pachyjuli P a r o n a 

 18962) (from the intestine of lulus communis) which is charac- 

 terized by the similar position of the vulva and excretory 

 aperture; the difference of Oxyuris pachyjuli from our species 

 is in the buccal apparatus („bocca trilobata"), the dimensions 

 of the oesophagus, the tail as well as the size of eggs. Lastly, 

 our species resembles Oxyuris lo7igicaudata A. Meyer^) 1896 

 to a certain degree (from the intestine of a Ceylon Julus sp.). 

 However, this parasite is so superficially described, and 

 Meyer's work — which served him as dissertation for the doc- 

 tor's degree— is supplied with such imperfect drawings that 

 it is exceedingly difficult to form any accurate zoological 

 characteristics of his parasite. Notwithstanding the nearly 

 equal size of the eggs and the position of the vulva, Oxyuris 

 longicaudata differs from our parasite both in the length of 

 the entire body (5,5—6,0 mm.), and in the length of the tail 

 (1,0 mm.), although the ratio of length of the tail to the length 

 of the entire body (about i:6) remains the same for both 

 parasites. In describing the oral capsule of his parasite, 

 A. Meyer mentions nothing about the 6-lobed labial forma- 

 tions peculiar to our species, which surround the mouth-ope- 

 ning from the exterior. And lastly, the intestine of Oxyuris 



1) Leidy. Proceed. Academ. Philadelph. V. 1850. p. 101, 1851, p. 285 

 and 1856, p. 60, also in: Smithson. Contrib. Y. 1853, p. 47. Tab. VII. fig. 13. 



2j Par on a. Di alcuni nematodi dei Diplopodi. BoUetino del Musei 

 di Zoologia e Anat. comp. della R. Universita di Genova. 1896. M 44. p. 2. 

 Tav. I. fig. 1—3. 



3) A. M e y e r. Neue Nematoden unter den Parasiten ceylonischer 

 Saugetiere iind eine Oxyuris, eine neue Schmarotzerspecies in Julus (Ceylon). 

 Inaug. Diss. Basel. 1896. p. 33—35. Fig. 17—19. 



