DESMODORINAE 133 



bristles present. Lateral organs circular. Pharjmx funnel- 

 shaped, preceded by a small " vestibule," and containing a 

 minute, forwardly-directed tooth (" ventral (?) " in descrip- 

 tion, dorsal in figure). Oesophagus gradually swollen behind, 

 without bulb. A pair of ocelli present. Genital organs not 

 described. Caudal glands and spinneret present. (Descrip- 

 tion based on a single immature male specimen). 



Hab. Marine. 



Genotype : /. acuta Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 329 and key. 



12. Synonema Cobb, 1920. 



Cuticle unstriated, without bristles. Head not distinct, 

 with four submedian bristles. Lip-region apparently with 

 twelve ribs ( ? folds). Lateral organs small, incipient spirals. 

 Pharjmx narrow, somewhat funnel-shaped, containing a 

 single dorsal tooth. Oesophagus with pyriform posterior 

 bulb-like swelling. Male unknown. Female genital tube 

 single, anterior, outstretched. Caudal glands and spinneret 

 present. (Description based on a single immature female 

 specimen). 



Hab. Marine. 



Genotype : S. braziliense Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 330 and key. 



13. Mesodorus Cobb, 1920. 



Cuticle very finely striated, without bristles except at 

 anterior end. Head not distinct, rounded, with twelve labial 

 papillae and three crowais of bristles. Lateral organs spiral. 

 Pharynx funnel-shaped, narrow, containing a single forwardly- 

 directed tooth near its anterior end. Oesophagus with a 

 " rather obscurely pyriform " posterior bulb. Caudal end of 

 male with twenty-five preanal supplementary organs. Spicules 

 slender. Two accessory pieces present. Testis single, an- 

 terior, straight. Female unknown. 



Hab. Marine. 



Genotype : M. cylindricollis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 325 and key. 



14. lotadorus Cobb, 1920. 



Cuticle coarsely striated, without bristles. Head not 

 distinct, truncate, with twelve papilla-like lips. Cephalic 

 bristles " probably " present. Lateral organs transversely 

 elliptical, situated far forward. Pharynx apparently very 

 narrow, completely filled by a forwardly-directed tooth. 

 Oesophagus with pyriform posterior bulb. Caudal end of 



