— 119 — 



costa posterior branches dichotomically in tlie posterior quar- 

 ter of its length, each of its branches forming a trident at 

 the end. As it is seen from this description, the caudal bursa 

 of the male in this species is formed after the type of some 

 Strongy lidae parasitic in mammals— as, e. g., in Ankijlostomum- 

 Two spicula of equal size, 0,221 mm. long, are of a very 

 characteristic form: their anterior half is wide, flat with a 

 granulated surface, whereas the hinder half is, on the con- 

 trary, cylindrical, filiform. The hinder end of the spiculum 

 terminates by a dichotomous furca, forming a sort of a hook 

 composed of two branches bent to the same side. With the 

 spicula is connected a spindle-shaped gubernaculum reaching 

 0,09 mm. in length. 



The female reaches 11,73 mm. in length with a width 

 of the body in the region of the end of the oesophagus =- 

 0,136 mm., in the region of the genital aperture = 0,136 mm., 

 at the level of the anus = 0,05 mm. Oral capsule 0,07 mm. 

 wide. Oesophagus, of the same character as that of the male, 

 occupies V23 part of the body-length, reaching 0,51 mm. in 

 length. The caudal end is narrowed, conically pointed; the 

 anus is situated at a distance of 0,22 mm. from the caudal 

 end. The vulva opens by an aperture between the third and 

 posterior quarters of the body-length, at a distance of 

 2,9 mm. from the caudal end (in another female specimen — 

 at a distance of 2,3 mm. from the caudal end). From the 

 short vagina 2 uteri diverge to opposite sides, they contain 

 a limited number of eggs arranged in one row and Avith 

 their long axis either parallel, or perpendicular to the body 

 length. The eggs are oval, 0,085 mm. long, 0,05 mm. wide, 

 and contain a well formed embryo. 



II. Genus Diaphanocephalus Dies. 



The position of this genus in the suborder Strongylata 

 is not yet fixed, and it is referred by the modern creator of 

 the system of S t r n g y 1 i d a e, prof. R a i 1 1 i e t, to a group 

 of „genres non encore classes". 



I propose the following diagnosis of this genus: 

 Middle-sized Nematodes the mouth opening of which has 

 the character of a narrow dorso-ventral slit leading into the 

 oral capsule consisting of 2 symmetrical, laterally arranged 



20* 



