156( s - s - 458 > THE MONONCHS 



wide as its base. An egg seen in the uterus measured 100 ^ in length. It is not 

 certain that caudal glands are present. 



Knowledge of this species rests very largely on the observations of Dr. J. G. de 

 Man, who says that it is an active species, common in sandy soils of the dune dis- 

 tricts of Holland. Occurs also in Germany, according to Brakenhoff, whose speci- 

 mens, however, have the dorsal tooth close to the lips instead of midway as in the 

 type form. Fig 22, previous page (after de Man). 



8. M. papillatus Bastian. Glands are present in the segments of the oesophagus, 

 and are most strongly developed in the posterior half. The secretion of the glands 



co , 2 7 in the dorsal segment 



3. 9.3 2b. *bl"-' 93. . . 



2.6 3.5 3.8 4.3 2.4 pours into the lumen 



of the oesophagus through a minute pore near the middle of 

 the neck, a short distance behind the nerve-ring. Under favor- 

 able conditions lenses of the highest power show transverse 

 striae to be interrupted on the lateral lines, where there are 2 

 ^ refractive longitudinal striations very close together. What 

 appears to be an ordinary ventral renette pore is found a short 

 xfso distance behind the nerve-ring. The writer's investigations 

 prove this species to be syngonic. The longitudinal ribs of the pharynx, probably 

 3 in number, are a little more prominently developed than usual. Occasionally a 

 subventral or submedian rib of the pharynx shows traces of most exceedingly fine 

 denticles. Only the most careful examination of favorable specimens shows these 

 denticles. The writer has never observed a denticulated ventral rib like that of 

 muscorum, as mentioned by Menzel. 



A common, voracious, cosmopolitan, nemativorous species. Found in many parts 

 of Europe and of the United States, and also in Hawaii, Australia, South America 

 and Asia. Fig. 23. See also fig. 8. 



9. M. intermedius Cobb. Truncate head having 6 lips, each with 2 papillae. 

 The elongated-oval amphids are half as wide as the base of the lip. The rather 

 long, goblet-shaped pharynx is half as long 2.5 7.4 24. '6i' 35 94. 



as the head is wide, and presents a mod- 2.4 2.4 2.8 3.3 2.4 

 erate-sized dorsal tooth two-thirds the way from the base to the lips. The intes- 

 tine, whose commencement is marked by the presence of a pseudo-bulb, shows a 

 rather indistinct tessellation. What appears to be a ventral renette pore occurs 

 just behind the nerve-ring. The lateral fields are one-fourth as wide as the body. 

 Caudal glands are present in the conical, arcuate tail. Spinneret almost pointed. 

 Anus depressed, consequently conspicuous. Vulva conspicuous. The reflexed por- 

 tions of the ovaries extend one-half way back to the vulva. 



Found about the roots of sugar cane, Harwood, Clarence River, New South 

 Wales, Australia.. Examined in water after fixation with osmic acid vapor. 



10. M. tenuicaudatus Stefanski. The lips are said to bear 6 large, spheroidal 

 papillae. A transverse element is said to traverse the wall of the pharynx opposite 



? ? 21. '50+* 94. the apex of the 



4 - ^ dorsal tooth, and 



to bear 2 slightly curved projections. The oesophagus 

 is muscular. At first the tail diminishes regularly in 

 diameter, but presents 2 swellings in the posterior part. 

 Found among algae, in the Rhone River, Switzer- 

 land. This species is said to resemble M. macrostoma 

 Bastian in the form of the buccal cavity, but to differ 

 from that species in the details of the structure of 

 the mouth, as well as in the form and length of the 

 tail. Fig. 24, after Stefanski. \\\ ^O> X 750 



