ONCHOLAIMINAE 119 



gonal anteriorly, three-sided posteriorly, containing a large 

 dorsal tooth and several much smaller teeth, some lateral, sopie 

 subventral. Oesophagus with cylindrical, muscular anterior 

 portion, and a non-muscular posterior portion which is 

 narrower anteriorly than the former, but expands gradually 

 behind. No oesophageal bulb. Caudal end of male with 

 preanal and postanal papillae. " Probably " two equal 

 spicules and an accessory piece present. Female genital 

 tubes paired, the posterior short and without ovary. 



Hab. On diseased Hyacinth bulbs. 

 Genotype : O. longicaudalus de Man, 1912. 



de Man, 1912, Zool. Jahrb., Syst., xxxiii, 637. 



19. Alaimonema Cobb, 1920. 



Cuticle finely striated, with scattered, inconspicuous bristles. 

 Head not distinct, with four crowns each of four bristles. 

 Lips indistinct. Lateral organs large, spiral. Pharjmx very 

 narrow, apparently three-sided, containing three small, sub- 

 equal teeth towards its anterior end. Oesophagus with a 

 pyriform posterior bulb. Caudal end of male with thirty- 

 seven prominent preanal supplementary organs. A slender 

 accessory piece present. Testis single, anterior, outstretched. 

 Female unknown. 



Hab. Marine (in sand). 



Genotype : A. multicinctum Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 327 and key. 



20. Aponchium Cobb, 1920. 



Cuticle inistriated, apparently without bristles. Head very 

 slightly distinct, with six labial papillae and a single crown 

 of four bristles. Lateral organs circular. Pharjnix small, 

 its cavity almost filled by three forwardly-directed teeth, of 

 which the dorsal is apparently smaller than the two sub- 

 ventral. Oesophagus with an elongated, pyriform, bulb- 

 like posterior swelling. Caudal end of male with twelve 

 highly-developed preanal supplementary organs having paired, 

 spiny, shallow, cup-shaped ends. Spicules slender. Two 

 accessory pieces present, with posterior processes, and also 

 a median piece between the spicules. Testis single, anterior, 

 reflexed. Female genital tube single, anterior, outstretched. 

 Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : A. cylindricolle Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 298 and key. 



