ONCHOLAIMINAE 121 



genital tubes paired, opposed, reflexed. Caudal glands and 

 spinneret present. 



Hab. Marine. 



Genotype : C. cinctum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 332 and key. 



24. Cylicolaimus de Man, 1889. 

 Cuticle unstriated, with lateral and submedian bristles. 

 Head not distinct, with three small lips and a crown of bristles. 

 Lateral organs very small, transversely elliptical. A series 

 of glands present in each lateral field. Pharynx relatively 

 wide, surrounded externally by a secondary chitinoid ring, 

 and with three forwardly-projecting tooth-like processes at 

 its base, through which the oesophageal glands open. There 

 may be a crown of denticles within the mouth-opening, 

 and behind these three larger teeth. In addition there may 

 be two or more forwardly-pointing triangular plates projecting 

 from the wall of the pharynx. Oesophagus gradually swollen 

 behind, without bulb. Caudal end of male with numerous 

 preanal and postanal bristles and a median preanal papilla 

 ( ? supplementary organ). Spicules short and broad. Acces- 

 sory piece composed of two lateral portions, each with a 

 posterior process. Testes paired, opposed, outstretched. 

 Female genital tubes paired, opposed, reflexed. Caudal 

 glands and spinneret present. 



Hab. Marine. 



Genotype : C. [Leptosomatum] magnus (Villot, 1875). 



Villot, 1875, Arch. Zool. exp. et gen., Paris, iv, 458 ; de Man, 

 1889, Mem. Soc. Zool. France, ii, 1; Jagerskiold, 1901, K. 

 Svensk. Vetensk. Acad. Handl., Stockholm, xxxv, 5; Southern, 

 1914, Proc. R. Irish Acad., xxxi, 39. 



25. Synonchus Cobb, 1894. 

 Cuticle finely striated, with short bristles, especially an- 

 teriorly, where they occur in bundles. Head truncate, with 

 ten bristles (two single lateral, four submedian pairs). Three 

 rather indistinct lips. Pharynx small, containing a prominent 

 dorsal tooth and two rudimentary subventral teeth. Oesoph- 

 agus gradually swollen behind. Caudal end of male with 

 a single preanal supplementary organ and irregular subventral 

 rows of preanal and postanal bristles. Spicules equal, slender. 

 Accessory pieces ( ? two) with long posterior process. Female 

 genital tubes paired, reflexed. No " tubiform organ." 

 Caudal glands present. 



Hab. Marine. 



Genotype : S. fasciculatus Cobb, 1894. 



Cobb, 1894, Proc. Linn. Soc. N.S.W., Sydney, (2) viii, 411. 



