166 (S. S. 468) 



THE MONONCHS 



male supplementary organs, according to de Man, about 12, mammiform and appar- 

 ently protrudable except the two anterior and the posterior, which are more or less 

 rudimentary. Series about twice as long as the tail. 



A cosmopolitan species. In Florida, the writer found this species feeding on the 

 larvae of Heterodera radicicola, an extremely serious root pest. Fig. 43, bottom p. 467. 

 30. M. denticulatus, n. sp. Onchus opposed by two small subventral onchi 

 farther back, the left a little farther forward than the right 

 Found in the Zambezi River, South Africa, among fresh 

 water algae. The peculiar form of the head and pharynx, 

 and the unusually large number of denticles are the promi- 

 nent characters of this species. Only a single mutilated 

 specimen has been seen by Dr. Micoletzky. As it is un- 

 likely that the large number of denticles shown in the 

 original figures can be due to moulting phenomena, it 

 would seem that this form differs distinctly from all others. 

 Fig. 44 (after Micoletzky). As neither Micoletzky's text 

 nor figure suggests moulting, the numerous rows of den- 

 ticles are assumed to be normal, 

 sp. Each rasp consisting of but 2 rows of denticles. The 



12. 32. 54 Y 94. 



31. M. sparsus, n. 



tail diminishes suddenly in size 2.9 

 behind the elevated anus, and 3.4 



4.3 4.2 3.8 2^7^ 



tapers somewhat in the posterior three-fourths. The terminus 

 is about one-fourth as wide as the base of the tail. The cau- 

 dal glands (?) lie opposite the rectum. 



Found in sphagnum from greenhouses, Department of Agricul- 

 ture, Washington, D. C., U. S. A. Flemming solution to glycer- 

 ine. Fig. 45. 



32. M. micrurus, n. sp. This odd form appears to have no submedian onchi. 

 Rasps of only about four rows of denticles. Amphids not seen. Lining of the 

 esophagus well-developed, occupying three-fifths of the optical longitudinal section. 

 3. 12. 33. Y 98. Intestine about 5 cells in girth, 



27? 37i 3.7 3. 2.2 not tessellated, or only faintly 



so. Tail very short and strongly arcuate or bent. Spinneret 

 about one-fifth as wide as the base of the tail. Rectum some- 



what shorter than the anal body-diameter; longer than the tail. 



Caudal glands not clearly seen, probably opposite the rectum. 



Ampullae of the caudal glands not very strongly developed. 

 Described from young specimens found about Litchi roots, 



Fukien, China. Resembles bremcaudatus. Characterized by the 

 extremely small and very strongly arcuate tail. The 

 spinneret is sometimes turned nearly at right angles to ^ 

 the axis of the tail. Flemming solution to glycerine. , 



Fig. 46. 



33- M. incurvus, n. sp. Striae resolvable with diffi- adsl 

 culty and into rows of dots. Dorsal onchus opposed 

 by 2 inconspic- 2 . 7.4 28. *63' 2 t 96.2 . 

 uous, ventrally 2.1 2.5 2.9 3.2 2.f^ " msiln 



submedian onchi of smaller size opposite its base. 

 The lining of the oesophagus is a prominent feature, strnurph 

 occupying about two-thirds of the apparent width of 

 the oesophagus. Intestine 12 to 15 cells in girth, not "^ 

 tessellated, its granules numerous and fine. Caudal ^ 

 glands 3, broadly saccate, opposite the anus, their 

 ampullae long and filling the posterior part of the tail. XTSO 



