60 ASCAROIDEA 



at the entrance to the pharynx might, however, be taken to 

 indicate relationship with the Oncholaimidae, and it would be 

 possible to include the genus in the subfamily Ironinae. 



d, Leptodera Dujardin, 1845. 

 Syn. Alloionetna Schneider, 1859 ; Alloeonema Leuckart, 

 1863. 



Body fusiform, tapering finely at both extremities. Mouth 

 with bilobed ( ?) border. A tubular buccal cavity present. 

 Oesophagus with a large posterior club-shaped swelling. 

 Caudal end of male with short alae supported by five or six 

 pairs of elongate papillae. Behind the alae the tail tapers to 

 a fine filament. Spicules equal, strongly curved, broad at the 

 roots. A small accessory piece present. Testis outstretched. 

 Vulva in the middle of the body. Female genital tubes 

 apparently oj)posed, outstretched. Viviparous. 



Hab. Genotype in the vas deferens of a slug. Other species 

 foiand in soil, decaying substances, etc., have been referred to 

 the genus. 



Genotype : L. flexiUs Dujardin, 1845. 



Dujardin, 1845, Histoire nai. des Hehninthes, Paris, 108; 

 Schneider, 1866, Monographie der Nematoden, Berlin, 154. 



e. Streptogaster Cobb, 1898. 



Head not distinct. Lips obscure. Buccal capsule cylin- 

 drical, apparently with four (?) supporting rods in its waU, 

 each having a small tooth at about its middle. Oesophagus 

 proper long and cylindrical, followed by a pyriform posterior 

 bulb with a short, narrow neck. Tail of male conical. 

 Apparently a single spicule and two accessory pieces present. 

 Several pairs of preanal and postanal papillae present. Testis 

 single, anterior, reflexed. Female not described. 



Hab. Not mentioned (presumably free-living). 

 Genotype : S. papillatus Cobb, 1898. 



Cobb, 1898, Agric. Gaz. N.S.W., Sydney, ix, 320. 



We have endeavoured to extract sufficient characters for a 

 generic diagnosis from the figures of the male given by Cobb. 

 The only description available is contained in the legend to 

 these figures, and the formula. It appears unlikely that the 

 genus can be recognized by means of the data available. 



f. Walcherenia de Man, 1921. 



Cuticle striated, apparently without bristles or lateral alae. 

 Head with bristles. Lateral organs unkiiown. Buccal cap- 

 sule cyUndrical, suddenly constricted behind. Oesophagus 



