102 ASCAROIDEA 



accessory pieces present. Testis single, anterior, outstretched. 

 Caudal glands and armed spinneret present. 



Hab. Marine. 



Genotype : S. brevicolle Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 242 and key. 



34. Stenolaimus Marion, 1870. 



Cuticle with bristles, closer together towards anterior end. 

 Head with six bristles, with or without papillae. Oesophagus 

 club-shaped. Male with long slender spicules and two acces- 

 sory pieces. Female genital tubes paired, opposed, reflexed, 

 the anterior branch being vestigial. Caudal glands and 

 spinneret present. 



Hab. Marine. 



Genotype : S. lepturus Marion, 1870. 



Marion, 1870, Ann. Sci. Nat., Paris, Zool., (5) xiii, (Art. 14), 

 16. 



35. Tycnodora Cobb, 1920. 



Cuticle thick, apparently unstriated and without bristles. 

 Lateral alae absent. Head with ten bristles. Lateral organs 

 linear. Oesophagus apparently without bulb. Male appar- 

 ently unknown. Female genital tubes paired, opposed, 

 reflexed. Caudal glands and spimaeret present. 



Hab. Marine. 



Genotype : T. pachydermata Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 231 and key. 



36. Xennella Cobb, 1920. 



Cuticle unstriated, with six to eight longitudinal ribs or 

 alae on each side of the body, without bristles. Head mitri- 

 form, distinct, with four or six bristles. Lateral organs 

 transversely elliptical, open behind. Oesophagus narrow, 

 gradually expanded posteriorly. Male with two accessory 

 pieces. Caudal glands and possibly spinneret present. 

 Female unknown. [Type specimens immature.] 



Hab. Marine. 



Genotype : X. cephalata Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 233 and key. 



37. Neurella Cobb, 1920. 



Cuticle finely striated, without bristles, but with narrow 

 lateral alae. Head not distinct, with apparently three lips 

 and four bristles. Lateral organs spiral. Buccal cavity 

 small. Oesophagus without bulb. Caudal end of male 

 apparently with a single flattened supplementary organ. 



