122 ASCAROIDEA 



26. Microlaimus de Man, 1880. 



Cuticle striated, without bristles or alae. Head distinct, 

 knob-like, without lips and usually without bristles. Cephalic 

 papillae usually indistinct. Lateral organs circular. Pharynx 

 narrow, goblet-shaped or cylindrical, containing a small tooth 

 on its dorsal wall, and sometimes two smaller subventral 

 teeth. Oesophagus with a posterior bulb. Caudal end of 

 male without papillae or supplementary organs. Two rod- 

 shaped accessory pieces present. Female genital tubes 

 typically paired, opposed. Caudal glands and spinneret 

 present. 



Hab. Soil, or fresh or brackish water. 

 Genotype : M. globiceps de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 15; 

 1884, Die frei . . . lebenden Nematoden der Niederl. Fauna, 

 51 ; Steiner, 1916, Zool. Jahrb., Syst., xxxix, 590; Micoletzky, 

 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 371. 



27. Odontobius Roussel de Vauzeme, 1834. 



Cuticle extremely finely, if at all, striated, without bristles. 

 Head not distinct, with four ( 'I six) very small bristles. 

 Lateral organs incipient spirals. Pharynx goblet-shaped, 

 rather wider than deep, with three small, blunt teeth at its 

 base and a single tooth in its dorsal ( ?) wall. Oesophagus 

 gradually swollen behind, without bulb. Tail of male with 

 three pairs of postanal papillae. Spicules flattened dorso- 

 ventrally. An accessory piece, with large posterior process, 

 present. Testis apparently single, outstretched. Female 

 genital tube single, anterior, outstretched. Caudal glands 

 and spinneret doubtfully present. 



Hab. Genotjrpe on baleen-plates in mouth of whales. 

 Certain free-living marine species have been attributed to 

 the genus, probably erroneously. 



Genotype : O. ceti Roussel de Vauzeme, 1834. 



Roussel de Vauzeme, 1834, Ann. Sci. Nat., Paris, Zool., i, 

 326; Bastian, 1865, Trans. Linn. Soc. London, xxv, 161; 

 Baylis, 1923, Ann. Mag. Nat. Hist., (9) xii, 617. 



28. Chromaspira Filipjev, 1918. 



Syn. Chromaspirina Filipjev, 1918. 



Cuticle striated. Head rounded, not distinct, with three 

 crowns of short bristles. Oral opening surrounded by a 

 slightly projecting cuticular wall. Lateral organs incipient 

 spirals. Pharynx with a relatively wide anterior portion, 

 with folded walls, and containing a large dorsal tooth and two 

 smaU subventral teeth, and a narrower posterior portion 



