94 ASCAROIDEA 



5. Aegialolaimus de Man, 1907. 



Cuticle striated but without bristles. Head slightly wider 

 than neck, without lips or bristles. Lateral organs large, 

 circular. Oesophagus with a posterior bulb and very wide 

 lumen. Male unknown. Female genital tubes probably 

 double and reflexed. Caudal glands present. 



Hab. Marine. 



Genotype : A. elegatis de Man, 1907. 



de Man, 1907, Tijdschr. Nederl. dierk. Vereen., Leiden, x, 

 228. 



6. Aphanolaimus de Man, 1880. 



Cuticle coarsely striated, without bristles. Lateral alae 

 present. Head not distinct, with stout bristles, but without 

 lips. Lateral organs circular or spiral, very large. Oesoph- 

 agus cylindrical, not enlarged posteriorly. Caudal end of 

 male with a median row of protrusible supplementary organs, 

 also lateral preanal and postanal " bristle-papillae." An 

 accessory piece present. Testes paired. Female genital 

 tubes paired, S3'mmetrical, rather short, apparently reflexed. 

 Caudal glands and spinneret present. Sometimes hermaph- 

 rodite. 



Hab. Marshy groimd, fresh or brackish water. 

 Genotyjae : A. attentus de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 5 ; 

 1884, Die frei . . . lebenden Nematoden der Niederl. Fauna, 

 34; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 142. 



7. Halalaimus de Man, 1888. 



Cuticle unstriated. Head without lips, but with a double 

 crown of bristles. Lateral organs elongate, narrow, longi- 

 tudinal grooves. Oesophagus slender, elongate, gradually 

 enlarged behind. Male without caudal papillae. Two equal 

 spicules and an accessory piece present. Testes paired. 

 Caudal glands present. 



Hab. Marine (littoral). 



Genotype : H. gracilis de Man, 1888. 



de Man, 1888, Tijdschr. Nederl. dierk. Vereen., Leiden, 2; 

 Filipjev, 1922, Act. Inst. Agronom. Stauropol., i (Zool.), 100. 



8. lotalaimus Cobb, 1920. 



Cuticle coarsely striated, without bristles. Crenate lateral 

 alae present. Head not distinct, without bristles. Lateral 

 organs semi-elliptical. Oesophagus slightly swollen posteriorly. 

 Caudal end of male with some small postanal papillae. An 

 accessory piece present. Testis and female genital tube 

 single, anterior, reflexed. No caudal glands or spinneret. 



