118 ASCAROIDEA 



e. Mijlonchulus Cobb, 1916. 



Dorsal tooth large, midway or further forward in the 

 pharynx. Subventral teeth frequently present. Ventral 

 denticles numerous, arranged in transverse rows or on 

 two rasp-like areas. Type : minor Cobb, 1893. 



f. Sporonchulus Cobb, 1917. 



Dorsal tooth as in Mijlonchulus. Subventral teeth 

 apparently absent. Ventral denticles irregularly 

 arranged. Type (by page precedence) : dentatus Cobb, 

 1917. 



16. Oionchus Cobb, 1913. 



Cuticle finely striated, without bristles or lateral alae. 

 Lateral organs stirrup-shaped. Head without bristles. Lips 

 indistinct. Two crownis of cephalic papillae present. Buccal 

 cavity narrow, cylindrical or prismatic, almost completely 

 filled by a dorsal spear-like tooth. Oesophagus cylindrical, 

 without bulb. Male unknown.* Female genital tube single, 

 anterior, reflexed. Tail short. Spinneret present. 



Hab. Soil, about roots of grass. 

 Genotype : 0. obtusus Cobb, 1913. 



Cobb, 1913, Journ. Washington Acad. Sci., iii, 442 and key; 

 1917, Soil Science, 453; 1918, in Ward & Whipi^le, Fresh- 

 water Biology, 487 ; Micoletzky, 1922, Arch. f. Naturg., Abt. A, 

 Ixxxvii, 367. 



17. Udonchus Cobb, 1913. 



Cuticle finely striated, without lateral alae. Lateral organs 

 transversely elliptical. Head rounded, without bristles. 

 Lips with two circles of papillae. Buccal cavity cup-shaped 

 in front, somewhat narrowed behind, containing a small 

 forwardly-directed dorsal tooth at the base of the cup-shaped 

 portion, and opposite to this a very minute ventral tooth. 

 Oesophagus with a posterior bulb. Male unknown. Tail 

 of female elongate, slightly swollen at the tip. Spinneret 

 present. Female genital tube single, anterior, reflexed. 



Hab. Fresh water. 



Genotype : U. tenuicaudatus Cobb, 1913. 



Cobb, 1913, Journ. Washington Acad. Sci., iii, 442 and key; 

 Micoletzky, 1922, Arch.f. Nctturg., Abt. A, Ixxxvii, 368. 



18. Odontopharynx de Man, 1912. 



Cuticle very finely striated, without bristles. Head with 

 papillae but without lips or bristles. Lateral organs trans- 

 versely elliptical. Pharynx spacious, longer than wide, hexa- 



* Cobb (1918) states that the male has a " bursa " anci unequal ori 

 equal spicules. 



