KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 15. N:0 7. 27 



The receptacle consists of two distinct parts, the lower one is funnel-shaped and 

 wrinkled, and furnished at the base with small glands; the upper part is rauch larger, 

 broadest at the top, bent över there, and tapering towards the place where it joins the 

 lower funnel-shaped part. 



The receptacle is not exactly twisted as in N. Vejdovskyi, but the thicker top is 

 merely bent över towards the general longitudinal axis of the organ. 



No perigastric cells. 



The inner and outer tube of the segmental organs are nearly of equal length 

 and both diverging from the middle lobe. 



The ovaries are small, in the ll lh and 12 th segments. 



The testes one pair in the 10 th segment and one larger pair in the ll Ul segment. 



The spines are of equal length and straight: 3. 3. 3. 3. 3. 



The length of the body about 8 m. m. 



The width of the same about 0,5 m. in. 



The number of segments about 43. 



The body is whitish and very much translucent in front of the cingulum, almost 

 eylindrical, but tapering towards the end, behind the cingulum. 



Habitat. Novaja Semlia at Matotschkin is the only locality where this worm was 

 hitherto fonnd. 



This species is very easily distinguished from its nearest allied species N. Vej- 

 dovskyi by the form of the receptacle, the segmental organs, and also through its 

 smaller size and the transparency of its body. 



5. Neoenchytranis callosus n. sp. 



Pl. XI. Fig. 21. 



The supra-cesophagial ganglion is about 1 / i time longer than broad, and the ante- 

 rior as well as the posterior margin is convex (fig. 21, g). 



The receptacle consists of a long tube furnished at the top with a gourd- or 

 flasklike receptacle proper (fig. 21 h, k, m, q). 



The vesicle of the efferent duct is of various forms, but not at all twisted. The 

 fascicle of spermatozoa projecting from the opening is extremely long, sometimes twice 

 as long as the vesicle itself (fig. 21, r, s, t). 



The epidermis of the body is extremely härd and glasslike. 



The inner tube of the segmental organs is considerably longer than the middle 

 lobe. The outer tube is very short or at least four times shorter than the middle 

 lobe (fig. 39). 



The perigastric cells are not free, but form a continuous stratum like that of A. 

 nasutus, only found every where in the body (fig. 21, u). 



The testes in the 9 th and 10 th and in the ll th segments = 2 pairs. 



The ovaries in the ll th and 12 th segments. 



The spines are short, in each fascicle 3. 4. 4. 3, the inner ones being the shortest. 



