FREE-LIVING FRESH-WATER NEMATODES 85 



creases with the distance from the anus, so that the space between 

 the seventh and eighth is about two-thirds as great as the diameter 

 of the body. Of the median papillae on the tail there are three; two 

 near the anus, and one just in front of the middle of the tail, with pos- 

 sibly a fourth farther back. In front of the anus, of the median papillae 

 there are two near the anus, and ten additional ones about coextensive 

 with the submedian rows and distributed in the same manner, the dis- 

 tance between successive papillae increasing with the distance from the 

 anus. The two equal, arcuate, uniform, blunt spicula are about one and 

 one-third times as long as the anal body-diameter. Their proximal ends 

 are not cephalated. The ejaculatory duct is about one-third as wide as 

 the body. The vas deferens is about one-half as wide as the body. 

 There are two outstretched testicles, the blind end of the anterior being 

 about twice as far from the end of the neck as this latter is from the 

 anterior extremity. The posterior testicle is a little shorter than the 

 anterior. 



Habitat: Cranberry bog, Arlington Farm. 



ACHROMADORA, Cobb, 1914. 

 Fig. 11, Plate V. 



28. Achromadora minima, Cobb. 



For original description see Macleay Memorial Volume, Sydney, 

 1893; see also Journal Washington Academy of Sciences, Oct. 4, 1914. 



