14G ASCAROIDEA 



bristles. Lateral organs oval. Pharynx much reduced, con- 

 taining anteriorly three large, single-pointed teeth carried on 

 chitinoid jaws. Oesophagus without bulb, unpigmented. 

 Caudal end of male with a few postanal papillae, but without 

 preanal papillae or supplementary organs. An accessory piece 

 present. Testes paired. Female genital tubes paired, 

 opposed, reflexed. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : T. [Enoplus] acutus (Villot, 1875). 



Villot, 1875, Arch. Zool. exp. et gen., iv, 460; de Man, 1893, 

 Mem. Soc. Zool. France, vi, 114. 



4. Xyala Cobb, 1920. 



Cuticle with numerous longitudinal alae, subdivided by 

 coarse transverse striations. A few bristles, in groups of four, 

 present in the cervical region, and a few subdorsal caudal 

 bristles. Head with two crowns of bristles. Lateral organs 

 circular. Lips form three simple, incurved, protrusible jaws. 

 Pharynx divided transversely into two portions by an internal 

 cuticular ridge. Oesophagus with pyriform pharyngeal 

 swelling, but without posterior bulb. Caudal end of male 

 without supplementary organs or papillae. Spicides slender. 

 Two slender accessory pieces present, their proximal ends 

 enveloping the spicules. Testes paired, opposed, outstretched. 

 Ovary single, anterior, outstretched. Caudal glands and 

 spinneret present. 



Hab. Marine. 



Genotype : X. striata Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 289 and key. 



5. Selachinema Cobb, 1915. 



Cuticle finely striated. Head with two crowns of bristles. 

 Lateral organs spiral. Pharynx " triangularly concave- 

 pyramidal," with three jaws ; two submedian, well developed, 

 one median, rudimentary. The jaws consist of two parts, 

 each bearing two rows of denticles. Oesophagus without 

 posterior bulb. Genital organs undescribed. (Description 

 based on a single immature specimen). 



Hab. Marine. 



Genotype : *S'. ferox Cobb, 1915. 



Cobb, 1915, Contr. Sci. Nematol., iv, 113. 



6. Fiacra Southern, 1914. 



Cuticle smooth or faintly striated. Head distinct, with a 

 single crown of ten stout bristles. Lateral organs cup-shaped. 

 Pharynx small, containing three jaws. The two submedian 



