MALE AND FEMALE UNGELLA 



395 



"hilt" have the general form of the ulti- 

 mate two-clawed segment of a beetle's 

 tarsus. (See Fig. 1.) Rather weakly 

 developed retractor muscles are at- 

 tached to the 'amalgamated onchial 

 apophyses. It seems not unlikely that 

 the caudal "suckers" may also aid as 

 a base of resistance in the use of the 

 onchium, the object of which must be 

 to claw; it must wound by clawing, 

 hence the specific name secta. When 

 the onchium is withdrawn and at rest, 

 as in the female of Figure 2, the outer 

 or distal parts of the two claws rest in 

 special lateral depressions on the out- 

 side of the front of the head (see concav 

 Fig. 1) and to that extent are not 

 withdrawn into the head. 



Oesophageal glands. The median 

 dorsad pore in the front of the head, 

 por dsl, is the exit of a large well de- 

 veloped special cervical gland, gl crv. 

 The excretory pore of the renette, p 

 ex, is farther back and ventral. There 

 is an almost imperceptible short alter- 

 ation in the oesophageal lining be- 

 tween the fore and after parts of the 

 oesophagus, probably the vestige of 

 a median bulb. The indistinctly cla- 

 vate, posterior,'non-valvate, oesopha- 

 geal swelling contains a single, bright, 

 refractive, three-micron nucleus near 

 the base in the dorsal sector, proving 

 the presence of an oesophageal gland. 

 Radial oesophageal muscles are only 

 faintly to be seen. 



Intestine. A cross-section of the 

 intestine cuts through only about two 

 relatively large cells. The refractive 

 lining of the intestine often is distinctly 

 to be seen. In the front portion of the 

 body the wall of the intestine is hardly 

 as thick as that of the body; here the 

 lumen of the intestine often is more 

 than twice as wide as the thickness of the intestinal wall. 



org wt?. 



'sub cut 'mac 



Fig. 2. Male 

 tna and female U. 

 secta. From al - 

 coholic earth- 

 worm speci- 

 mens. All nemas 

 adult, females 

 outnumbering males. 



X400 



