84 ASCAROIDEA 



Hab. Marine. 



Genotype : P. exile Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 274 and key. 



23. Ascolaimus Ditlevsen, 1919. 

 Syn. BatJiylahnus Ditlevsen, 1919, 7iec Cobb, 1894, nee 

 Daciay, 1905. 



Cuticle very finely striated, apparently without bristles or 

 lateral alae. Head rather distinct, with papillae and a crown 

 of bristles. Lateral organs large, double, incipient spirals. 

 Buccal capsule a long and narrow funnel whose walls are 

 continuous with the lining of the oesophagus. Oesophagus 

 slightly swollen behind. Male unknown. Female genital 

 tubes paired, opposed, outstretched. 



Hab. Marine. 



Genotype: A. filiformis T>ii\e\^e,x\, \Q\'d. 



Ditlevsen, 1919, Vid. Medd. Naturh. Foren., Copenhagen, 

 Ixx, 168, 299. 



24. Stephanolaimus Ditlevsen, 1919. 



Cuticle coarsely striated, apparently without bristles or 

 lateral alae. Head with a funnel-shaped circumoral dilatation, 

 and with four long bristles. Lateral organs absent ( ?). 

 Buccal capsule moderately large, funnel-shaped, continuous 

 with lining of oesophagus. Oesophagus swollen posteriorly. 

 Male unknown. Vulva behind the middle of the body.* 



Hab. Marine. 



Genotype : S. elegans Ditlevsen, 1919. 



Ditlevsen, 1919, Vid. Medd. Naturh. Foren., Copenhagen, 

 Ixx, 183. 



25. Dactylaimus Cobb, 1920. 



Cuticle rather coarsely striated, without bristles. Head 

 with six lips (of which three are larger than the others) with 

 hooked bristles at their tips. Twelve cephalic bristles present. 

 Lateral organs spiral. f Buccal capsule funnel-shaped. Oesoph- 

 agus gradually swollen behind. Male unknown. Female 

 genital tube single, anterior, outstretched. Description 

 based on a single immature female specimen. 



Hab. Marine (in mud). 



Genotype : D. aequalis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 250 and key. 



* Description based on a single immature female. 

 t According to the key circular or elliptical, but in the figure 

 distinctly spiral. 



