120 ASCAROIDEA 



21. Catanema Cobb, 1920. 



Cuticle finely striated. Head with ten bristles, of which 

 four are longer than the rest and three-jointed. Lateral 

 organs minute, directed forwards. Pharynx narrow, con- 

 taining anteriorly several ( ? six) small teeth. Oesophagus 

 with a posterior bidb. Caudal end of male with one small 

 preanal supplementary organ, preceded by a number of minute 

 ventral bristles. Seven pairs of subventral postanal supple- 

 mentary organs also present. An accessory piece ( ? two 

 accessory pieces) present, with posterior process. Testis 

 single, anterior, outstretched. Female undescribed. Caudal 

 glands and spinneret present. Genus apparently based on a 

 single male specimen. 



Hab. Marine (in sand). 

 Genotype : C. exile Cobb, 1920. 



Cobb, 1920, Contr. Sci. NematoL, ix, 271 and key. 



22. Pseudobathylaimus Filipjcv, 1918. 



Syn. Bathylaimus Daday, 1905, 7iec Cobb, 1894, nee Ditlev- 

 sen, 1919; Dadayia Micoletzky, 1922, 7iec Travassos, 1921. 



Cuticle markedly striated, without bristles. Head not 

 distinct, without lips but with four or six bristles. Lateral 

 organs unknown. Pharynx usually long, in two portions, 

 the anterior with tooth-like structures, the posterior with 

 longitudinal ribs. Oesophagus with a posterior bulb. Two 

 or four rows of ocelli present. Caudal end of male, in the 

 genotype, with numerous preanal supplementary organs. 

 Two accessory pieces present. Female genital tubes paired, 

 opposed, outstretched ; or unpaired, anterior. Caudal glands 

 and spinneret present. 



Hab. Fresh water. 



Genotype : P. [Bathylaimus] maculatus (Daday, 1905). 



Daday, 1905, Zoologica, Stuttgart, xviii, 59; Filipjev, 

 1918, Trav. Lab. Zool., Stat. Biol. Sehastopol, Ser. II, No. 4, 

 347; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 328. 



23. Croconema Cobb, 1920. 



Cuticle thick, coarsely striated, with many short, slightly- 

 curved bristles. Head slightly swollen, apparently covered 

 by a single helmet-like cap of cuticle, bearing at least six 

 irregular longitudinal rows of bristles. Apparently twelve 

 small lips present. Lateral organs small, spiral. Pharynx 

 narrow, nearly as long as the cephalic cap, its lumen nearly 

 filled by the apices of teeth, of which one dorsal and one 

 larger, submedian, have been made out. Oesophagus gradu- 

 ally swollen behind, without bulb. Male unknown. Female 



