142 ASCAROIDEA 



posterior shorter and outstretched. In connection with the 

 male genital organs there are several glands opening into the 

 ejaculatory duct behind. Female genital tubes paired, the 

 anterior without ovary, the posterior reflexed. Caudal glands 

 and spinneret present, the latter ventral. 



Hab. Marine. 



Genotype : T. oceanvs Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 297 and key. 



7. Synodontium Cobb, 1920. 



Cuticle rather finely striated, with bristles towards the 

 extremities. Head not distinct, apparently with six lips, 

 each bearing a papilla. Six long and stout cephalic bristles 

 present. Lateral organs very indistinct. Pharynx funnel- 

 shaped, fairly large, with a ring of twelve ( 1) small teeth at its 

 anterior end. Oesophagus " ends posteriorly in a faint, 

 elongated, pyi'iform, valveless bulb." Caudal end of male 

 with fifty to seventy preanal supplementary organs. Spicules 

 slender. Two accessory pieces present, with blunt posterior 

 processes. Testes paired, opposed, outstretched. Female 

 genital tube single, posterior, outstretched. Caudal glands 

 and spinneret present, the latter terminating in a hemispherical 

 button with three eversible sectors. 



Hab. Marine. 



Genotype: S. fecundum Cohh, 1Q20. 



Cobb, 1920, Contr. Sci. Nematol, ix, 280 and key. 



8. Trigonolaimus Ditlevsen, 1919. 



Cuticle unstriated and withovit bristles. Head rounded, with 

 two crowns of bristles. Lateral oi'gans hoop-shaped. Pharynx 

 long, prismoid, with the apex directed backwards. Anteriorly 

 it contains a bundle of six stout, slightly curved, apparently 

 movable, chitinoid rods with their tips projecting forwards 

 ( ? three bicuspid teeth), and near the bases of these a number 

 of small prismatic bodies. Oesophagus somewhat swollen 

 posteriorly. An accessory piece, with a posterior process, 

 present. Female genital tubes paired, opposed. 



Hab. Marine. 



Genotype : T. armatiis Ditlevsen, 1919 (by page precedence). 



Ditlevsen, 1919, Vid. Medd. Naturh. Foren., Copenliagen, Ixx, 

 177. 



9. Diodontolairaus Southern, 1914. 



Cuticle coarsely striated. Head not distinct, with conical 

 labial papillae and a single crown of four submedian bristles. 

 Lateral organs incipient spirals. A cylindrical buccal capsule 

 present, with thick walls, and armed with two subventral 



