— 126 — 



with the bursal alae) — 0,85 ram. The caudal end is provided 

 at the sides with a slightly asymmetrical bursa, 0,85 ram. in 

 width. The bursa is finely striated in transverse direction, 

 the stripes joining the mosaic- network in the anterior part 

 of the bursa, the network passing unto the alae from the 

 ventral surface of the body. The cuticle of the body in the 

 region of the caudal end is characterized by a very pretty 

 structure consisting of a complex network of longitudinally 

 and transversally winding grooves crossing each other at 

 different angles; on account of all this the cuticle presents a 

 beautiful drawing which seems to be composed of separate 

 stellate alveoles arranged in the form of mosaic. However, 

 above this chaos of networks there dominate pretty regularly 

 winding lines which are arranged in a transverse direction 

 with regard to the body-length. This plexus attains its grea- 

 test development in the region, where the most anterior 

 preanal papillae are situated, although on the median line 

 there is a zone to which the abovementioned drawing does 

 not extend. Towards the caudal end this original structure of 

 the cuticle gradually becomes limited to the lateral edges of 

 the body and disappears near the anal aperture; the latter 

 is situated at a distance of 0,17 mm. from the caudal 

 end. 



There are 7 pairs of preanal papillae; they are all stalk- 

 shaped, the surface of the stalks being characterized by a 

 structure similar to that of the lateral edges of the body. 

 The free ends of the papillae are also of a very pecuUar 

 structure, having the form of a crown of a double-flower con- 

 sisting of a whole complex of petal-shaped lobes arranged 

 into more or less regular concentric layers. The first papiUae 

 (beginning from the cloaca) are organized most simply, and 

 consist of 1 — 2 concentric layers of petals; but towards the 

 anterior end the character of the papillae gradually becomes 

 more complicated attaining its greatest complexity at the 6-th 

 and 7-th pairs, as at this level the reticular character on the 

 ventral surface of the cuticle of the body passes, as I have 

 mentioned above, to the surface of the alae, and, as a result, 

 it presents the picture given in the figure. 



There are 4 pairs of postanal papillae; they are somewhat 

 asymmetrically arranged as on the right side the second pa- 

 pilla takes a lateral position, and on the left side— the first 



