DESMODORINAE 131 



situated far forward. Pharynx with cup-shaped anterior 

 portion and nearly cylindrical posterior portion, the latter 

 occupied by a short spear-like tooth with a barb, like a fish- 

 hook. This tooth is apparently protrusible. Oesophagus 

 with large oval posterior bulb. Male unknown. Female 

 genital tube probably single, posterior. (Description based 

 on a single immature female). 



Hab. Marine. 



Genotype : O. ferox Ditlevsen, 1922. 



Ditlevsen, 1922, Vid. Medd. Naturh. Foren., Copenhagen, 

 Ixxiii, 4. 



6. Digitonchus Cobb, 1920. 



Cuticle rather finely striated, without bristles. Head not 

 distinct, with three, perhaps double, lips, six labial papillae 

 and six rather stout bristles. Lateral organs spiral, situated 

 far forward. Pharynx elongate, with short wide portion 

 anteriorly, and a narrow posterior portion, containing a long, 

 " spear-like " tooth. Male undescribed. Female genital 

 tubes paired, opposed, reflexed. Caudal glands and spinneret 

 present. 



Hab. Marine (in sand). 



Genotype : D. uniformis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 314 and key. 



7. Anticyclus Cobb, 1920. 



Cuticle unstriated, without bristles. Head not distinct, 

 with six indistinct lips and two or three crowns of bristles. 

 Lateral organs large, circular. Pharynx relatively short and 

 wide, with a single conical tooth at its base. Oesophagus 

 gradually swollen behind, without bulb. Caudal end of male 

 with seventeen equidistant preanal supplementary organs. 

 Two accessory pieces present. Testes paired, opposed, out- 

 stretched, the posterior considerably the shorter. Female 

 genital tube single, anterior, outstretched. Caudal glands 

 and spinneret present. 



Hab. Hot salt springs. 

 Genotype : A. exilis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 331 and key; Mico- 

 letzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 128. 



Micoletzky apparently regards Anticyclus as a subgenus of 

 Linhomoeus. 



8. Cophonchus Cobb, 1920. 



Cuticle with very fine transverse and also longitudinal 

 striations. A few short bristles in the cervical region. Head 

 rather narrowed, with thickened cuticle. Lips apparently 



