ANGUILLULININAE 69 



Hab. Soil ( ?). 



Genotype : N. galeatus Cobb, 1913. 



Cobb, 1913, Journ. Washington Acad. Set., iii, 434. 



6. Hoplolaimus Daday, 1905. 



Syn. Iota Cobb, 1913; Criconema (also Krikonema) Hof- 

 mariner and Menzel, 1914 ; Ogma Southern, 1914. 



Cuticle with wide, often prominent annulations, sometimes 

 forming series of " scales " or spines, but without bristles. 

 Lateral alae absent. Head sometimes distinct. Lips usually 

 poorly developed. Six cephalic papillae or bristles may be 

 present. Lateral organs unknown. Stylet very long, more 

 or less obviously formed of three rods, and knobbed behind. 

 Stylet of male appears to be lost at the last moult. Male 

 (known only in H. [Iota] squamosus) with two spicules, without 

 accessory piece or caudal papillae, and with single, anterior, 

 outstretched testis. Female genital tube single, anterior^ 

 outstretched, or paired, opposed, outstretched. Oviparous! 

 Probably usually hermaphrodite. Caudal glands and spin- 

 neret absent. Anus sometimes absent in female. 



Hab. Fresh water or soil. 



Genotype : H. tylenchiformis Daday, 1905. 



Daday, 1905, Zoologica, Stuttgart, xviii, 62; Cobb, 1913, 

 Jour7i. Washington Acad. Sci., iii, 434, 437 ; Hofmanner and 

 Menzel, 1914, Zool. Anz., xliv, 88 ; Menzel, 1917, Rev. Suisse 

 ZooL, XXV, 153; Micoletzky, 1922, Arch. f. Naturg., Abt. A 

 Ixxxvii, 577. ' 



7. Pailenchus de Man, 1921. 



Cuticle striated, without bristles. Head slightly distinct, 

 rounded, without lips, papillae or bristles. Lateral organs 

 transversely elliptical, situated far forward. Stylet slender, 

 hollow, not knobbed behind. Caudal end of male with alae' 

 without papillae. An accessory piece present. Female 

 genital tubes paired, symmetrical, outstretched. Caudal 

 glands probably absent. 



Hab. Soil. 



Genotype : P. hilarulus de Man, 1921. 



de Man, 1921, Capit. Zool., i, 36. 



8. Isonchus Cobb, 1913. 

 Cuticle finely striated, without bristles or alae. Head not 

 distinct, without lips or bristles. Lateral organs unknown. 

 Stylet long, not knobbed at base. Caudal end of male with 

 alae, with four pairs of ray-like papillae. Foiu- pairs of smaller 

 papillae also present. An accessory piece present. Testis 

 and female genital tube single, anterior, outstretched. Caudal 

 glands absent. 



