FREE-LIVING NEMATODES 505 



Spiculum single 71 



Vagina of the adult cylindroid, S-shaped. . . Limnomermis Daday. 



Vagina tubular (?) not S-shaped Pseudomermis deMsLii. 



Cuticula with criss-cross fibers 74 



Vagina of the adult S-shaped 75 



Spiculum single Paramermis von Linstow. 



Spicula two Mermis Dujardin. 



Vagina of the adult not S-shaped Bathymermis Daday. 



Longitudinal fields eight 79 



Cuticula without criss-cross fibers Hydromermis Corti. 



Cuticula with criss-cross fibers Eumermis Daday. 



IMPORTANT REFERENCES ON FREE-LIVING NEMATODES 



Bastian, C. 1865. Monograph of the Anguillulidae. Trans. Linn. Soc, 



Lond., 25: 73-84; S pl- 

 BuTSCHLi, O. 1873. Beitrage zur Kenntnis der freilebenden Nematoden. 



Nova acta caes. leop., 36; 144; 11 pl. 

 Cobb, N. A. 1913. New Nematode Genera Found Inhabiting Fresh- 

 Water and Non-Brackish Soils. Jour. Wash. Acad. Sci., 3: 432-444. 

 1914. The North American Free-living Fresh-Water Nematodes. Trans. 



Amer. Micr. Soc, 33; 69-134; 8 pl. 

 De Man, J. G. 1884. Die frei in der reinen Erde und im siissen Wasser 



lebenden Nematoden d. Niederlandischen Fauna. 206 pp.; 34 pl. 

 Tagerskiold, L. a. 1909. Freilebende Siisswassernematoden. Siisswasser- 



fauna Deutschlands, Heft 15; 46 pp.; 65 figs. 

 Maupas, E. 1899. La mue et I'enkystement chez les Nematodes. Arch. 



zool. exper. (3), 7: 562-628; 3 pl. 

 1900. Modes et formes de reproduction des Nematodes. Arch. zool. 



exper. (3), 8: 462-624; 11 pl. 

 MicoLETZKY, H. 1913. Freilebende Siisswassernematoden der Ostalpen. 



Sitzber. Kais. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. I, 122 : iii- 



122, 543-548. 

 Steiner, G. 1913-1914. Freilebende Nematoden aus der Schweiz. Archiv. 



Hydrobiol. und Planktonk., 9: 259-276, 420-438. 



