62 ASCAROIDEA 



i. Dasynema Cobb, 1920. 



Cuticle very coarsely striated, without bristles, but with 

 eight longitudinal alae. Head with two crowns of bristles. 

 Lips three, each armed at the summit with a short internal 

 tooth. Lateral organs spiral. Buccal cavity rather narrow. 

 Oesophagus with a median club-shaped swelling and a distinct 

 posterior bulb. Caudal glands and spimieret present. Descrip- 

 tion based on a single immature specimen, apparently of 

 unknown sex. 



Hab. Marine. 



Genotype : D. sexalineatum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 253 and key. 



j. Halaphanolaimus Southern, 1914. 

 Cuticle coarsely striated. Head separated from body by a 

 circular groove, and with four submedian bristles. Lateral 

 organs spiral. Neck with " chitinous gland-ducts," three in 

 male, two in female, on ventral surface. A narrow buccal 

 capsule present. Oesophagus with a posterior bulb. Caudal 

 end of male apparently with preanal supplementary organs. 

 Two simple accessory pieces present. Testes paired, parallel. 

 Female genital tubes paired, symmetrical. Caudal glands 

 l^resent. 



Hab. Marine. 



Genotype : H. pellucidus Southern, 1914. 



Southern, 1914, Proc. R. Irish Acad., xxxi, 11. 



k. Antomieron Cobb, 1920. 

 Syn. Eutelolaimus de Man, 1922. 



Cuticle coarsely striated, without bristles. Lateral alae 

 present. Head with bristles. Lateral organs each consisting 

 of two concentric ellipses. Buccal capsule very minute, 

 conoid. Oesophagus expanding in middle and with a small, 

 elongate, posterior bulb. Caudal end of male with eight 

 preanal, protrusible supplementary organs. Preanal and 

 postanal bristles present. Accessory piece present. Testes 

 paired, opposed ; the anterior outstretched, the posterior 

 reflexed. Female genital tubes paired, symmetrical, reflexed. 

 Caudal glands present. 



Hab. Marine. 



Genot3rj^)e : A. jiellucidum Cobb, 1920. 



Cobb, 1920, Contr. Set. Nematol., ix, 241 and key; de Man, 

 1922, Tijdschr. Ned. Dierk. Ver., xviii, 126. 



de Man, in describing Eutelolaimus, from females only, 

 suggests that this genus is probably identical with Antomieron 

 Cobb, of which the male only has been described. 



