— 146 — 



At a distance of 0,6 mm. from the cephalic end are situa- 

 ted the neclv papillae. On both sides of the body, beginning 

 from the cephalic end, are situated alae which narrow towards 

 the posterior end. 



The genital aperture is in the anterior half of the body, 

 at a distance of 4,25 mm. from the cephalic end. The speci- 

 mens investigated were not yet mature, and contained no eggs. 



The most interesting features of this parasite are its head 

 and the armament of its buccal organs. Like in all species of 

 Plujsaloptera in our parasite there are also present 2 large 

 lips with a large medial denticle on each. However, on both 

 sides of this denticle in each lip there are a whole series of 

 smaller denticles arranged on its interior surface. These den- 

 ticles differ greatly from those of the species Plujsaloptera 

 abbreviata Kud. in their form, mode of distribution, size and 

 number. On each lip of our species, laterally to the main 

 medial denticle, are arranged 10 — U smaller pointed 

 denticles on each side; concerning their form and size, all of 

 them are of a triangular form, and situated so, that near 

 the largest, central denticle there sit 4 denticles of conside- 

 rably smaller size, these are followed by 2 larger denticles; 

 the most laterally situated denticles being the smallest. 



I succeeded in making a preparation in which the labial 

 apparatus could be viewed from above (see fig. 68). It revea- 

 led the following interesting picture: in the centre of the pre- 

 paration was the opening of the mouth of the parasite lined 

 on both sides by zigzags of the abovenamed denticles. 



On the sides of each lip are arranged 2 large papillae 

 of peculiar structure which, probably, allows them to become 

 shorter or longer by contracting, after the principle of a 

 telescope. 



The peculiar structure and arrangement of the denticles 

 on the lips of this parasite make it possible to distinguish 

 Physaloptera britmiica sp. n, from other representatives of the 

 same genus. 



F. Fam. Filarildae Claus 1885. 



In the collection investigated there were only 2 species of 

 Filariidae, belonging to the genus Diplotriaena Raill. et 

 Henry 1909. 



