52 ASCAROIDEA 



Male of genotype unknown. In another species, tail of male 

 without supplementary organs. Spicules stoutish. A single 

 accessory piece present. Female genital tubes paired, re- 

 flexed. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : 6'. attenuatum Cobb, 1920. 



Cobb, 1920, Contr. Scl. Nematol., ix, 264 and key. 



12. Colpurella Cobb, 1920. 



Cuticle finely striated, without lateral alae or bristles. Six 

 lips present. Lateral organs trapezoidal. Buccal capsule 

 long and tubular. Oesophagus with slight posterior swelling. 

 Caudal end of male with five papillate supplementary organs. 

 Testes paired, parallel. Spinneret absent. Female unknown. 



Hab. Fresh water. 



Genotjrpe : C. fontinalis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 257 and key. 



13. Cynura Cobb, 1920. 



Cuticle without bristles. Lateral alae present. Head with 

 four cephalic bristles. Lateral organs spiral. Buccal capsule 

 narrow and elongate. Oesophagus cylindrical, slightly swoUen 

 posteriorly. Male unknown. Female genital tubes paired, 

 opposed, reflexed. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : C. uniformis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 262 and key. 



14. Xinema Cobb, 1920. 



Cuticle finely striated. Body with papilliform bristles, and 

 without lateral alae. Lateral organs spiral. Head with three 

 lips and four bristles. Pharynx apparently narrow, tubular. 

 Oesophagus cylindrical, gradually expanding behind. Caudal 

 end of male without supplementary organs or special bristles. 

 A pair of jointed spicules, and a pair of accessory pieces, with 

 long posterior processes, present. Testes paired, opposed, 

 outstretched. Female genital tubes paired, opposed, out- 

 stretched, or, occasionally, reflexed at their ends. A pair of 

 " spermathecae '' apparently present, extending, when filled, 

 to near the bases of the ovaries. Caudal glands present, near 

 the anus. 



Hab. Marine. 



Genotype : X. perfectum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 263 and key. 



