TRILOBIDAE 79 



radial muscles. Oesophagus cylindrical, expanding behind 

 into an elongate bulb. Caudal end of male with four adanal 

 pairs of elongate papillae supporting membranous alae. 

 Three other pairs of caudal papillae present, two of which are 

 close to the tip. Spicules and accessory piece possibly absent. 

 Testis single, anterior, reflexed ( ?). Female genital tube 

 single, anterior, reflexed. Caudal glands and spinneret 

 absent. 



Hab. Soil. 



Genotype : M. heterurus Cobb, 1920. 



Cobb, 1920, Gontr. Sci. Nematol., ix, 274 and key ; Micoletzky, 

 1922, Arch.f. Naturg., Abt. A, Ixxxvii, 192. 



9. Zanema Cobb, 1920. 



Cuticle finely striated, without bristles or lateral alae. 

 Head not distinct, with six ( ?) lips bearing appendages. A 

 double crown of cephalic bristles present. Lateral organs 

 circular. Phar3Tix " somewhat spheroidal." Oesophagus 

 without posterior bulb. Caudal end armed with short, 

 backwardly- projecting, thorn-like bristles, ten on each sub- 

 ventral line. Female genital tube probably single, anterior. 

 Caudal glands and spinneret absent. Male unknown. 



This diagnosis is based on a single, probably immature, 

 female. 



Hab. Marine. 



Genotjrpe : Z. acanthurum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 283 and key. 



10. Paraphanolaimus Micoletzky, 1923. 



Cuticle coarsely striated, without bristles. Narrow lateral 

 alae present. Head not distinct, with four short bristles. 

 Lateral organs open spirals. A short and broad buccal capsule 

 present, prismatic or cylindrical. Oesophagus gradually 

 thickened behind, with a slight posterior pear-shaped, feebly 

 muscular bulb. Male unknowTi. Female genital tubes 

 paired, opposed, reflexed, ovaries short. Viviparous or 

 ovoviviparous. Caudal glands and spinneret present. 



Hab. Fresh water. 



Genotype : P. behningi Micoletzky, 1923. 



Micoletzky, 1923, Arb. Biol. Wolga-Stat., vii, 23. 



11. Pseudonchus Cobb, 1920. 



Cuticle finely striated transversely, without bristles or 

 lateral alae. Head not distinct, apparently with two lateral 

 lips. Ten cephalic bristles present. Lateral organs spiral. 

 Pharynx of irregular shape, with ridges, giving the appearance 



