26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Subfamily Comesominae. 



Genera: Comesoma Bastian, 1865; Lahnella Cobb, 1920; Dentatonema 

 Kreis, 1928. 



KEY TO SUBFAMILIES OF MONHYSTERIDAE 



1. (4) Amphids roundish. 



2. (3) Mouth capsule variable, but never with thick walls 



or free Monhysterinae 



3. (2) Mouth capsule with thick chitinized walls, partly 



free and adjoining the cuticle of the head . . . Sphaerolaiminae 



4. (i) Amphids spiral in several windings Comesominae 



The Monhysteridae possess as a rule only one ovary, the anterior 

 one (fig. 51) ; in relation with this the vulva is situated very far 

 backward. The above mentioned chitinous ring of the vestibulum is 

 well developed; in Sphaerolaiminae it is enlarged and forms a spa- 

 cious mouth capsule (fig. 53). The amphids are round or spiral 

 (Comesominae, fig. 54) ; the round form seems to be a secondary 

 one, arising from the spiral by the reduction of its inner coils. The 

 spicules are long or short. The gubernaculum is generally well de- 

 veloped, sometimes with a backward-pointing process, but never so 

 strongly developed as in the following family. 



Subfamilies and Genera of the Family Linhomoeidae 



Subfamily Linhomoeinae. 



Genera: f Litotes Cobb, 1920; Liuhomoeus Bastian, 1865 (sg. Eulinhomoe- 

 us de Man, 1907; sg. Paralinhovioeus de Man, 1907; syn. Anticyclus 

 Cobb, 1920); Rhadinema Cobb, 1920; Monhysteriella Kreis, 1929; 

 Crystallonema Cobb, 1920; Odontobius Roussel de Vauzeme, 1834; 

 Linhonioella Cobb, 1920; Metalaimus Kreis, 1928; Metalinhomoeus 

 de Man, 1907; Prosphaerolaimns Filipjev, 1918 (syn. Anficyathus 

 Cobb, 1920); Synonema Cobb, 1920; Desmolaimus de Man, 1880; 

 Terschellingia de Man, 1888; Aegialoalaimus de Man, 1907; Eleuther- 

 olaimus Filipjev, 1922; Oligomonhystera Micoletzky, 1922; Zanema 

 Cobb, 1920; Chloronemella Allgen, 1929; Halinema Cobb, 1920; Rhi- 

 nonema Allgen, 1927; Solenolaimus Cobb, 1893 (syn. Anthraconema 

 Zur Strassen, 1904) ; Siphonolaimus de Man, 1893 (syn. Chromagaster 

 Cobb, 1893) ; Southernia Allgen, 1929; Cyartonema Cobb, 1920; Dtsco- 

 nema Filipjev, 1918. 



Subfamily Axonolaiminae. 



Genera: Margonema Cobb, 1920; Fimbriella Allgen, 1929; Axonolaimus 

 de Man, 1889; Synodontium Cobb, 1920; Ascolaimus Ditlevsen, 1919 

 (syn. Bathylaimus Ditlevsen, 1919, preocc.) ; Apodontiwn Cobb, 1920; 

 Odontophora Biitschli, 1874 (syn. Conolaimus Filipjev, 1918; syn. 

 Trigonolaimus Ditlevsen, 1919) ; Synonema Cobb, 1920; Araeolaimus 

 de Man, 1888; Conolaimella Allgen, 1930; Araeolaimoides de Man, 

 1893; Coinonema Cobb, 1920; Diplopeltis Cobb, 1905 (syn. Discophora 



