CYLINDROLAIMINAE 65 



Testes paired, the anterior reflexed, the posterior outstretched. 

 Female genital tubes paired, opposed, outstretched. Caudal 

 glands and spinneret present. 



Hab. Marine. 



Genotype : P. granulifera Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 268 and key. 



22. Rhadinema Cobb, 1920. 



Cuticle apparently unstriated, without bristles or alae. 

 Head not distinct, with four bristles. Lateral organs circular. 

 Lips confluent. Buccal capsule minute, shallow and cup- 

 shaped, its wall supported by six small longitudinal ribs. 

 Oesophagus slightly swollen posteriorly. Male unknown. 

 Female genital tubes paired, opposed, outstretched. Caudal 

 glands and spinneret present. 



Hab. Marine (in sand). 

 Genotype : R. flexile Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 256 and key. 



23. Rhynchonema Cobb, 1920. 



Cuticle rather coarsely striated, without bristles. Head not 

 distinct, with ten bristles. Lateral organs circular. Lips 

 confluent. Buccal capsule long and tubular. Oesophagus 

 without bulb. Caudal end of male with three minute supple- 

 mentary organs. Spicules slender. A single accessory piece 

 present. Testis and female genital tube single, anterior, 

 outstretched. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : R. cinctum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 260 and key. 



24. Myctolaimus Cobb, 1920. 



Cuticle faintly striated. No lateral alae or bristles. Head 

 with six large conical lips. Lateral organs absent. Buccal 

 capsule very long, about twice as long as the oesophagus, in 

 two approximately equal parts ; the anterior part a simple, 

 narrow tube, the posterior an elongate bulb with triangular 

 lumen. Oesophagus a narrow tube, gradually expanding into 

 a posterior bulb. Tail of male without alae or supplementary 

 organs. Nine pairs of papillae present, of which six are 

 postanal. Spicules slender. Two accessory pieces, sigmoid. 

 Testis single, reflexed. Tail of female conically pointed. Female 

 genital tubes paired, opposed, reflexed. Spinneret absent. 



Hab. In sheep-dung. 



Genotype : M. pellucidus Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 276 and key. 



