100 ASCAROIDEA 



Hab. Marine (among Algae). 

 Genotype : /. ocellatum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 235 and key. 



26. Leptonemella Cobb, 1920. 



Cuticle striated, the striations retrorse posteriorly, the 

 reverse anteriorly, without bristles or lateral alae. Head 

 with eighteen small bristles. A few scattered bristles also 

 present in the cervical region. Lips indistinct. Lateral 

 organs apparently straight transverse slits. Oesophagus 

 with wide pyriform posterior bulb. Caudal end of male 

 with several submedian, slender, cuticular " thorns." An 

 accessory piece present. Testes paired, opposed, oiitstretched. 

 Caudal glands and spinneret present. Female unknown. 



Hab. Marine. 



Genotype : L. cincta Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 244 and key. 



27. Litinium Cobb, 1920. 



Cuticle smooth or faintly striated, without bristles or 

 lateral alae. Head with twelve bristles. Mouth merely a 

 pore. Oesophagus gradually expanded behind. Male un- 

 known. Female genital tube single, posterior, reflexed. 



Hab. Marine (in sand). 

 Genotype : L. aequale Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 234 and key. 



28. Litotes Cobb, 1920. 



Cuticle thin, without bristles. Lateral organs very incon- 

 spicuous. Male apparently unknown. Female genital tube 

 single, anterior, outstretched. Eggs few. 



Hab. Marine (among Algae). 

 Genotype : L. minuta Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 230 and key. 



29. Molgolaimus Ditlevsen, 1922. 



Cuticle apparently unstriated, without bristles. Head 

 rounded, not very distinct. Lateral organs absent. Oesoph- 

 agus short and thin, with a large globular bulb posteriorly. 

 [Another bulb may possibly be present.] Caudal end of male 

 without postanal papillae but with two small preanal papillae. 

 Spicules very long, filiform. No accessory piece seen. Female 

 genital tubes paired, reflexed. Vulva somewhat in front of., 

 the middle of the body. 



Hab. Marine. 



Genotype : M. tenuispiculum Ditlevsen, 1922. 



