NO. 6 CLASSIFICATION OF NEMATODES FILIPJEV I 5 



Others they are represented as simple papillae, a condition which could 

 be considered as more primitive than that in the Enoplidae; in the 

 Enoplidae there is only one genus, Enchelidium, that has such a row 

 of papillae. 



The second subfamily, the Mononchinae (fig. i), has a very wide 

 buccal capsule with thick walls. The cephalic setae are transformed 

 into papillae, perhaps because of the method of swallowing prey, 

 since the mouth capsule functions only as a sucker, without any mas- 

 ticating function, and setae would hinder the close adherence of the 

 prey to the lips. Very typical features here are the preanal row of 

 numerous papillae, sometimes transformed into chitinous tubes, and 

 a very strong bursal musculature. The caudal glands and the spin- 

 neret are present, with very rare exceptions. 



The Tripyloidinae is a group of marine genera resembling in 

 their head characters the Trilobinae, with a typical complex spicular 

 apparatus in all of them. Some doubts as to whether they belong in 

 the Enoplata arise from the shape of the amphids, which are not of 

 the typical pocket form, but are spiral or rounded (fig. i8). In the 

 genus Halanonchus, the males of which have the same typical spicu- 

 lar apparatus, the amphids are almost of the pocket type (fig. 19), 

 which makes very probable the interpretation of the form of the 

 others as being of the modified pocket type. 



Subfamilies and Genera of the Family Dorylaimidae 



Subfamily Alaiminae. 



Genera: Alahnus de Man, 1880; Litonema Cobb, 1920. 

 Subfamily Ironinae. 



Genera: Thalassironus de Man, 1889; Dolicholaimus de Man, 1889; 

 Ironella Cobb, 1920; Trissonchulus Cobb, 1920; Syringolaimns de 

 Man, 1889; Ironus Bastian, 1865. 

 Subfamily Tylencholaiminae. 



Genera: Diphtherophora de Man, 1880 (syn. Chaolaimus Cobb, 1893) 

 Pharetrolaimus de Man, 1922c; fEcphyadophora de Man, 1922c; Ty 

 lencholaimiis de Man, 1876 (syn. Brachynema Cobb, 1893, preocc.) 

 Tylolaimophorus de Man, 1880, probably synonymous with Tylencho 

 laimiis (syn. Archionchus Cobb, 1913) ; Tylencholaimellus Cobb, 1915 

 Xiphinema Cobb, 1913; Triplonchium Cobb, 1920. 

 Subfamily Dorylaiminae. 



Genera: Trichodorus Cobb, 1913; Leptonchus Cobb, 1920 (probable syno- 

 nym of Trichodorus) ; Longidorus Micoletzky, 1922; Oionchns Cobb, 

 1913; Campydora Cobb, 1920 ; Sectonema Thorne, 1930; Nygolaiiniis 

 Cobb, 1913; Chrysonema Thorne, 1929; Dorylaimus Dujardin, 1845 

 (sg. Discolaimiis Cobb, 1913 ; syn. Antholaimiis Cobb, 1913; sg. Dory- 



