ENOPLINAE 147 



jaws bear each a large tooth, the dorsal jaw two small teeth. 

 Oesophagus without bulb. Caudal end of male with a large 

 median preanal papilla and a double row of subventral 

 bristles. A sheath-like accessory piece present. Female 

 genital tubes paired, opposed, reflexed. Caudal glands 

 present. 



Hab. Marine. 



Genotype : F. longisetosa Southern, 1914. 



Southern, 1914, Proc. R. Irish Acad., xxxi, 34. 



7. Dignathonema Filipjev, 1918. 



Cuticle striated. Head not distinct, with submedian 

 bristles. Lateral organs large, spiral. Pharyngeal walls 

 apparently represented by three rod-like jaws, contained 

 within a much swollen anterior part of the oesophagus, and 

 bearing anteriorly each three teeth, of which the two outer 

 are bifid, the middle tooth simple. The dorsal jaw and its 

 teeth are apparently much less well developed than the others, 

 and the jaw itself not well chitinized. Oesophagus much 

 swollen behind. Female genital tubes short, reflexed. Male 

 unkno^\'n. 



Hab. Marine. 



Genotjrpe : D. bulbosa Filipjev, 1918. 



Filipjev, 1918, Trav. Lab. Zool, Stat. Biol. Sebastopol, Ser. II, 

 No. 4, 205. 



Filipjev, in his generic diagnosis, states that there are two 

 large lateral lips and two large papillae. His figures indicate 

 the presence of three lips, and our diagnosis, as regards the 

 head, is chiefly based upon the figures. The genus is con- 

 sidered by Filipjev to resemble closely Cyatliolaimus and 

 Halichoanolaimus, although highly specialised for carnivorous 

 habits. We consider it much more nearly related to Enoplus, 

 Triodontolaimus, Selachinema and Fiacra, with one of which 

 it may possibly prove to be synonymous. 



8. Rhabdotoderma Marion, 1870. 



Cuticle with characteristic transverse ring-shaped thicken- 

 ings, and with scattered bristles. Head not distinct, truncate, 

 with a crown of bristles. Pharynx elongate, apparently 

 containing (three ?) broad teeth at its anterior end. Behinil 

 the.se there is a complex apparatus consisting of two jaw-like 

 structures, with serrate internal surfaces, in connection with 

 two stouter chitinoid rods, directed posteriorly and converg- 

 ing towards their posterior ends. Each of these rods carries 

 three teeth at intervals along its inner surface. Oesophagus 

 slightly swollen behind, without bulb. A pair of ocelli 



