— 122 — 



surrounded by 3 basal and 3 accessory lips the length of 

 which reaches only ^3 of the length of the basal lips. 



The lips are of nearly regular quadrangular form with 

 traces of a slight groove both on the anterior and lateral 

 edges; the peripheral part of the lip is occupied by a transpa- 

 rent fine membrane bordered by a dentated margin. The 

 median part of the lip has a deep fissure on the interior side, 

 the fissure widens anteriorly. The fissure divides both lobes 

 of the pulp which has no remarkable features in this species. 

 The most characteristic in our species is the presence of den- 

 tated formations situated on the interior surface of the lips 

 in their posterior half. Here is a formation which is concave 

 towards the oral lumen, its upper slightly concave edge, as well 

 as its lateral edges, are covered with small denticles with 

 their points directed anteriorly. This character distinguishes 

 our parasite from other related forms. 



The male reaches 150—180 mm. in length at a maxi- 

 mum width 0,085 — 1,36 mm. The oesophagus is comparatively 

 short, only 6—7 mm. long. The caudal end is rounded, with 

 a small knobbed tip. The aperture of the cloaca is situated 

 at a distance of 0.255 mm. from the caudal end. In the region 

 of the cloaca the width of the body of the parasite is 0,476 mm., 

 but at the level where the oesophagus passes into, the intestine — 

 0,765 mm. Two equal, slightly curved spicula, of a. simple 

 structure without any alate diverticula, are 4,08 mm. long. 

 The posterior end of the spicula is rounded in the ^ shape of 

 a spoon. 



The distribution of the papillae is very original: I counted 

 48 pairs of preanal papillae, of these 6 pairs are arranged 

 laterally, and 42 pairs submedially. The lateral papillae have 

 the character of concave formations with a rounded knobbed 

 tip; the submedian papillae on the contrary, have the character 

 of flat round bodies, not protruding above the surface of the 

 cuticle, and surrounded by an oval ridge, on account of which 

 each papilla resembles an eye surrounded by the contour of 

 the eye-lids. The mutual arrangement of the papillae is exactly 

 drawn in the figure 17 of the table III, to which I refer the 

 reader. 



Female. By chance it happened that nearly all the fe- 

 males at my disposal were shorter than the males, the adult 

 forms reaching 75 — 100 mm. in length. The width of the body 



