58 ASCAROIDEA 



and with papillae. Uterine branches two, reflexed. No caudal 

 glands or spinneret. 



1. Bunonema Jagerskiold, 1905. 



Syn. Bogdanowia Zograf, 1913. 



Cuticle apparently smooth, except between the rows of 

 warts, where it is finely tessellated or slightly granular. Slight 

 lateral alae typically present. One or two rows of paired 

 " warts," usually lateral. Buccal cavity apparently three- 

 sided. Labial structures complex, asymmetrical and appar- 

 ently protrusible. A variable number of cephalic bristles 

 present. Oesophagus with a true posterior bulb and a slight 

 median swelling. Tail of male with about eight pairs of 

 papillae, three pairs of which are preanal. Two equal spicules 

 and an accessory piece present. 



Hab. In moss or rotting wood. 

 Genotype : B. richtersi Jagerskiold, 1905. 



Jagerskiold, 1905, Zool. Anz., xxviii, 557 ; Cobb, 1915, 

 Contr. Sci. Nematol., iii, 101 ; Zograf, 1913, Zool. Anz., xli, 

 162. 



2. Craspedonema Richters, 1908. 



Cuticle with " crust-like " swellings irregularly distributed 

 all over the dorsal surface, but smooth ventrally. Lateral 

 alae well developed, with jagged edges. Head distinct, 

 conical, probably surrounded by six pointed cuticular flaps 

 in front. Buccal cavity tliree-sided. Oesophagus without 

 median swelling. Male with slender spicules and linear 

 accessory piece. 



Hab. In moss. 



Genotjrpe : C. javanicum Richters, 1908. 



Richters, 1908, Ber. Senckenb. Ges., Frankf. a. M., 23; 

 Steiner, 1916, Zool. Anz., xlvi, 332. 



Appendix to Rhabditidae. 



The following genera are referred to the family with some 

 uncertainty, and owing to the present rather unsatisfactory 

 characterization of the subfamilies Rhabditinae and Cylindro- 

 laiminae, we do not attempt to refer these doubtful genera to 

 either group. 



a. Zalonema Cobb, 1920. 



Cuticle finely striated, without bristles or lateral alae. 

 Head not distinct, with four bristles (?). Lateral organs 

 spiral. Pharynx tubular, sinuous, with two prominent irregu- 

 larities of its wall, one dorsal and one ventral. Oesophagus 

 cylindrical, with broad pyriform posterior bulb. Caudal end 

 of male with preanal alae, but without supplementary organs. 



