— 148 - 



The large spiculum reaching 0,714 mm. in length, and 0,037 — 

 0,04 mm. in width at the base, is of an elongated form, and 

 bent ventrally in the shape of a sabre. The structure of this 

 spiculum is very peculiar: it seems to consist of 2 parts, the 

 manubrium and the sabre-shaped part. 



The manubrium, composing ^/s part of the length of the 

 whole spiculum, has a basal anterior end in the form of a 

 rough tubercle which serves for the attachement of the retrac- 

 tor muscles. The body of the manubrium is cylindrical, flat- 

 tened on the sides, and bears a characteristic sculpture on 

 its surface which is uniformly striated in a transverse direc- 

 tion to the spiculum. On both edges of the body of the 

 manubrium these parallel striae form a peculiar denticulated 

 festoon, which is exactly represented in our drawing (fig. 

 72 and 73). 



In its posterior portion the manubrium is split into two 

 branches the continuation of which forms the posterior sabre- 

 shaped portion of the spiculum. One of these branches is 

 somewhat shorter than the other. Both these branches are 

 united by a special thin membrane which covers the free 

 posterior end of the spiculum in the form of a case. Owing 

 to the abovenamed branches being more convex than the 

 membrane connecting them, the latter forms a kind of chan- 

 nel which apparently serves to allow the sperm to flow into 

 the female genital apparatus. 



The small spiculum which forms a spiral, reaches 

 0,442 mm. in length, and 0,05 mm. in width at the basal 

 swelling. This spiculum consists of a basal chitinous body 

 bent spirally, and accompanied on all its course by a thin 

 membrane. 



The mutual arrangement of the spicula is also peculiar: 

 the basal portion of the small spiculum is situated to the 

 right from the large one; further, in the middle of its length, 

 the small spiculum passes on the dorsal part of the large one 

 to the left side, where it remains adjacent to the left side of 

 the large spiculum with its free posterior extremity. Its posi- 

 tion on the right and left side of the large spiculum at the 

 same time is due to the spiral winding of its body. 



The female reaches 36 mm. in length at a maximum 

 width— 0,7 mm. in the region of the posterior part of the 

 oesophagus. The width of the body in the region of the ge- 



