ALAIMIDAE 99 



22, Campylaimus Cobb, 1920. 



Cuticle finely striated. Lateral alae present. Head with 

 a terminal cap, set oflE by a minute constriction, and with 

 bristles which are asymmetrically placed. Mouth ventral, 

 without distinct lips. Lateral organs elongate, half hoop- 

 shaped. Oesophagus somewhat expanded behind. Testis 

 apparently single. Female genital tubes paired, opposed, 

 outstretched. Caudal glands " appear to be located in front 

 of the anus, probably a long distance in front of it." 



Hab. Marine (in sand and mud). 

 Genotype : C. inaequalis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 232 and key. 



23. Helalaimiis Onorato-de Cillis, 1917. 



Cuticle unstriated, without bristles. Head not distinct, 

 without lips or bristles. Lateral organs circular. No true 

 buccal capsule, but a very smaU cuticular vestibule. Oesoph- 

 agus slightly expanded posteriorly. Tail of male appar- 

 ently without preanal or postanal papillae. Spicules large. 

 A small accessory piece present. Female genital tube single, 

 anterior, outstretched. Caudal glands present. 



Hab. Fresh water. 



Genotjrpe : H. psilocejihalus Onorato-de Cillis, 1917. 



Onorato-de Cillis, 1917, Monit. Zool. Ital., xxviii, 45, 58. 



24, Hemicycliophora de Man, 1921. 



Cuticle rather coarsely striated, without bristles. Head 

 hemispherical, distinct, without lips or bristles. Lateral 

 organs probably elliptical. Oesophagus probably has a small 

 bulb at about its middle. Caudal end of male alate, but 

 without papillae. Spicules rather large. Presence of an 

 accessory piece uncertain. Female unknown. Diagnosis 

 based on a single male specimen. 



Hab. Soil. 



Genotjrpe : H. typica de Man, 1921. 



de Man, 1921, Capit. Zool, i, 33. 



25. lonema Cobb, 1920. 



Cuticle thin, without bristles. Head without lips but with 

 four bristles. Lateral organs small, labial, unclosed, very 

 inconspicuous. Oesophagus cylindrical, diminishing in thick- 

 ness posteriorly. Ocelli present. Male unknown. Caudal 

 end without bristles. Female genital tubes paired, opposed, 

 reflexed. Caudal glands and spinneret present. 



