86 ASCAROIDEA 



bristles present. Each lip with a two-jointed bristle and 

 apparently also armed internally with a slender, flexible 

 element longer than the bristle. Lateral organs circular or 

 elliptical. Buccal cavity large and funnel-shaped. Oesoph- 

 agus probably without bulb. Caudal glands and spinneret 

 present. " Genital organs not described. 



The diagnosis is apparently based upon immature specimens. 



Hab. Marine (in mud). 



Genotjrpe : X. striatus Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 250 and key. 



30. Necticonema Marion, 1870. 



Cuticle finely striated, and with fine granulations. Head 

 blunt, with small papillae and a crown of bristles. Buccal 

 capsule very narrow, consisting of a slight dilatation of the 

 oesophageal lumen. •[" No chitinous armature in mouth."] 

 Male with broad spicules and several anterior accessory pieces 

 of varying shape. 



Hab. Marine. 



Genotype : A', jninzi Marion, 1870. 



Marion, 1870, Ann. Sci. Nat., Paris (Zool.), xiii, 32, 34. 



31. Coinonema Cobb, 1920. 



Cuticle finely striated, without lateral alae, apparently with 

 bristles towards anterior end (figure). Head not distinct, 

 with four bristles. Lateral organs spiral, somewhat hook- 

 shaped. Buccal capsule " obscure " (tubular in figure). 

 Oesophagus slightly enlarged posteriorly. Two ocelli present. 

 iSpicules slender. Two accessory pieces present, with blunt 

 posterior processes. Testes and female genital tubes paired, 

 opposed, outstretched. Caudal glands and spinneret present. 



Hab. Marine. 



Genotjrpe : C. punctatum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 259 and key. 



32. Prismatolaimus de Man, 1880. 



Cuticle finely striated, usually without bristles or lateral 

 alae. Head not distinct, without lips but with bristles. 

 Lateral organs linear, indistinct. Buccal capsule short, 

 prismatic, unarmed. Oesophagus scarcely enlarged poste- 

 riorly. Male with a median row of preanal papillae, extending 

 forward into the oesophageal region. Accessory piece absent. } 

 Female genital tubes paired and opposed, or unpaired, anterior 

 and reflexed. Caudal glands present. * 



Hab. Soil or fresh water. 



Genotype : P. [Monhystera] intermedins (Biitschli, 1873). 



