SUBGENUS MONONCHUS 



(S.S.457) 155 



4. M. teres, n. sp. This comparatively small, simple form has 2 submedian 

 teeth of equal size. Walls of the intestine with numerous granules of rather uni- 

 form size, giving rise to a faint tessellation ; the granules such that 2 to 3 would be 

 required to span one of the 3.9 12. 35. 60 Y 94. 



amphids. Tail rather strongly 3~4 37 375 372 2.^ ' " 

 arcuate, its fairly well developed spinneret about one-fifth as wide 

 as its base. Caudal glands somewhat elongated, their small but 

 rather conspicuous ampullae nearly filling the posterior fifth of 

 the tail. 



Description prepared from a single, more or less shrunken speci- 

 men, found in the sphagnum of a pot in which blueberry plants 

 were being cultivated. Bears a general resemblance to papillatus, but differs in the 

 form of the pharyngeal teeth and of the terminus. Flemming solution to glycerine. 

 Fig. 19. 



5. M. monhystera, n. sp. Amphids not seen. Lining of the rectum and of the 

 intestine rather distinct and refractive. Intestine only faintly tessellated, if at all. 



3.3 9.7 27. '78 19 94 Tail arcuate . rather 



37 37s 76 372 27s~ 1-1 M blunt, without spin- 

 neret. From the rather conspicuous, more or less elevated 

 vulva, the vagina, which is two-thirds as long as the body is 

 wide and tubular, extends obliquely inward and forward. 

 Nothing definite is known with regard to the eggs or the 

 form of the ovary. 



Found about the roots of orange trees, Bahia, Brazil. Bears 

 a general resemblance to M. papillatus, but has only one 

 ovary. This species is nemativorous. Flemming solution to 

 glycerine. Fig. 20. 



6. M. vorax, n. sp. This voracious species has a large mouth cavity and the 

 oesophagus is therefore at first slightly swollen. Intestine 12 to 20 cells in girth, 

 not tessellated. The 2 .7 8. 27. >67' 22 92. 



terminus of the arc- 



1.4 BE 



2.1 2.3 2.7 2.6 1.6 



uate tail is about one-seventh as wide as its base. The 



elongated eggs are about twice as long as the body is 



wide. Each ovary contains about 30 developing ova, 



arranged irregularly. Small sperm cells were seen in 



abundance at the flexure, in a condition indicating that 



the species is syngonic. 



Found in soil from a white cedar swamp in Wiscon- 

 sin, and from a cranberry bog in New Jersey, U. S. A. 



This is apparently a voracious feeder on other nema- 

 todes. Remains of Dorylaimus 

 and Ironus were seen in the 

 intestine. Resembles M. mac- 



mr t* -~fl \^~ft rnstoma, but the tail is conoid and has no spinneret. Sub- 



limate to balsam. Fig. 21. 



T. M. parvus de Man. De Man mentions the presence 

 of minute teeth at the base of the pharynx, near the be- 

 3.1 - 9.5 29. *63< 93. ginning of the oesoph- 



17 ^ ^ gTj; ^7 l.l n agus. Lining of the 



oesophagus well developed. Intestine apparently about 10 

 to 12 cells in girth, tessellated. Rectum somewhat shorter 

 than the anal bodv-diameter. Tail arcuate; its terminus only about one-eighth a 



