CYLINDROLAIMINAE 53 



15. Halinema Cobb, 1920. 



Cuticle with a few short bristles in neck region. Head with 

 ten bristles, four of which are very long. Lateral organs 

 circular. Buccal capsule short and wide. Oesophagus 

 cylindrical, very slightly swollen posteriorly. Caudal end of 

 male with preanal supplementary organs. Spicules slender. 

 Two accessory pieces present, with tapering posterior pro- 

 cesses. Testes paired, opposed ( ?). Tail of female with eight 

 pairs of subventral bristles. Female genital tubes paired, the 

 posterior vestigial. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : H. spinosum Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 267 and key. 



16. Crystallonema Cobb, 1920. 



Cuticle with scattered bristles in neck region. Longitudinal 

 fields contain large, doubly-refractive, crystalline masses. 

 Head with ten bristles, four of which are long and two-jointed. 

 Mouth surrounded by several labial " palps." Lateral organs 

 circular. Buccal capsule short and wide. Oesophagus with 

 a faint, elongate, more or less pyriform posterior swelling. 

 Caudal end of male without supplementary organs or caudal 

 bristles. Accessory piece with a posterior process. Testis 

 single, outstretched. Female genital tubes paired, opposed, 

 but posterior uterine branch vestigial. Ovary outstretched. 

 Spinneret absent. 



Hab. Marine. 



Genotype : G. simile Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 282 and key. 



17. Halanonchus Cobb, 1920. 



Cuticle without bristles or lateral alae. Head with three 

 crowns each of six bristles. Lips inconspicuous. Lateral 

 organs circular. Buccal capsule deep and wide, supported 

 by longitudinal ribs. Oesophagus cylindrical, without bulb. 

 Caudal end of male with fifteen to eighteen inconspicuous 

 supplementary organs. Spicules blunt. A single accessory 

 piece present. Testes paired, opposed, outstretched. Female 

 genital tube single, posterior, outstretched. Spinneret absent. 



Hab. Marine. 



Genot3rpe : H. macrurus Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 266 and key. 



18. Elium Cobb, 1920. 



Cuticle finely striated, without bristles or lateral alae. 

 Head truncate. Ocelli present. Lips inconspicuous. Cephalic 



