— 133 — 



In examining the anterior, narrowed end of the body we 

 notice that its first two rings differ widely from the rest: 

 the first ring is modified into special buccal organs — the lips; 

 the second ring forms a swollen fillet, differing from the 

 succeeding uniform rings both in its greater diameter, and 

 greater length (the length of the 2-nd ring is equal to 

 the length of the 4 succeeding taken together). The first 

 ring consists of 3 equal lips between which are situated 

 3 small cuticular outgrowths which compose something 

 like rudimentary intermediate lips (as in many Ascarids). 

 Each lip is composed of 2 parts situated one above another 

 in two stories: the posterior (lower) part has the form of 

 a convex rectangle on the sides of which are situated 2 

 large papillae; the anterior part of the lip is considerably 

 smaller than the posterior, and has a small groove in the re- 

 gion of its upper edge; on its exterior surface are situated a 

 pair of small papillae, and on its interior surface directed 

 into the buccal cavity is situated a small crest composed of 

 minute chitinous denticles. Thus, each of the three lips of 

 this parasite bears 4 papillae arranged in 2 stories. The abo- 

 venamed relations between the separate parts of lips are 

 represented in fig. 38 and in the accompanying scheme (fig. 39) 

 which shows the buccal organs of this parasite as seen from 

 in front. 



The mouth-opening passes into the oesophagus the 

 entire length of which reaches 0,425 mm., the width of the 

 cylindrical portion being 0,04 mm. The posterior part of the 

 oesophagus is modified into a spherical bulb, the diameter 

 of which is 0,085—0,09 mm. long. At the point where the 

 cylindrical portion passes into the bulb, the former narrow^s 

 so as to form a constriction. The bulb is provided with a 

 chitinous masticating apparatus. The initial part of the inte- 

 stine is very swollen; the anal aperture opens near the base 

 of the tail, at a distance of 1,105 mm. from the tip of the 

 latter. The width of the body on the level of the anus is only 

 0,085 mm. The excretory pore is situated on the level of the 

 anterior edge of the oesophageal bulb. The genital aperture 

 is replaced toward the anal aperture, being situated some- 

 wiiat anteriorly to the latter. The oval eggs, comparatively 

 few in number, are about 0,085 mm. long, at a width= 

 0,051 mm. 



12 



