ALAIMIDAE 103 



Testes paired, parallel. Female genital tubes paired, op- 

 posed ( ?). Caudal glands and spinneret apparently absent. 



Hab. Marine. 



Genotype : N. simplex Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 246 and key. 



38. Nannolaimus Cobb, 1920. 



Cuticle coarsely striated, without bristles except in cervical 

 region. Head not distinct. Lips confluent. Two crowns 

 of cephalic bristles present. Lateral organs spiral. Buccal 

 cavity very small. Oesophagus without bulb. Ocelli present. 

 Male unknown. Caudal end of female with a few median 

 bristles. Female genital tubes paired, opposed, reflexed. 

 Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : N. guttatus Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 255 and key. 



39. Cytolaimium Cobb, 1920. 



Cuticle finely striated, without bristles. Head not distinct, 

 with six papillae and six stout three-pointed bristles. Lateral 

 organs circular, open behind. Buccal capsule very small. 

 Oesophagus cylindrical. Caudal end of male with sixteen 

 pairs of discoid subventral supplementary organs, of which 

 five are postanal. A slender accessory piece present. Testes 

 and female genital tubes paired, opposed, outstretched; 

 anterior testis much larger than posterior. Caudal glands 

 and spinneret ( ?) absent. 



Hab. Marine. 



Genotype : C. exile Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 251 and key. 



40. Dlplopeltis Cobb, in Stiles & Hassall, 1905. 



Syn. Dipeltis Cobb, 1891, nee Packard, 1885. 



Cuticle very finely striated, with or without conspicuous 

 bristles. Head with three lips, of which one is more pointed 

 than the others, and spear-like. In the genotype there are 

 four submedian rows of about twelve stout bristles on the 

 neck. Lateral organs with a thickened margin, more pointed 

 in front than behind and extending to the base of the lips. 

 Buccal capsule very small, " seems to be armed with a minute 

 labial spear " [see reference already made to shape of lips]. 

 Oesophagus club-shaped. Ocelli sometimes present. An 

 accessory piece present, with a posterior process. Testes 

 apparently paired and opposed. Female genital organs 

 unknown. Caudal glands present. 



