ENOPLINAE 145 



and a varying number of bristles. The lips may, in some 

 species, be considerably reduced. Lateral organs oval, 

 inconspicuous. Cavity of pharynx much reduced, funnel- 

 shaped, containing three jaws, each of which consists of a 

 more or less complex chitinoid structure, connected with one 

 of the lips, and provided with a simple or complex tooth 

 anteriorly. Oesophagus not distinctly muscular, without 

 posterior bulb, and frequently much pigmented, the pigment 

 sometimes forming ocelli. Caudal end of male with preanal 

 and postanal bristles, and with a single supplementary organ. 

 A pair of accessory pieces present. Female genital tubes 

 paired, opposed. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : Probably E. tridentatus Dujardin, 1845, accord- 

 ing to Stiles & Hassall (1905). 



Dujardin, 1845, Histoire naturelle des Helminthes, Paris, 

 233 ; Bastian, 1865, Trans. Linn. Soc. London, xxv, 147 ; 

 Southern, 1914, Proc. R. Irish Acad., xxxi, 48. 



Eno])lolaimus and Enoploides are treated by Micoletzky 

 (1922) as subgenera of Enoplus. There is considerable 

 variation in the form of the jaws in Enoplus {sens, lat.), and we 

 do not feel that the species can at present be grouped conveni- 

 ently in subgenera based on the structure of these organs. For 

 similar reasons we have included Demonema in the synonjrmy. 



2. Synonchium Cobb, 1920. 

 Cuticle rather coarsely striated, with transverse rows of 

 large circular elements, and on each side two irregular sub- 

 lateral rows of pores. Head truncate, the mouth surrounded 

 by a ring of twelve slight swellings ( ? lips), and behind these 

 two crowns of six papillae each. Lateral organs spiral. 

 Pharynx rather narrow when closed, containing three large, 

 elongate, protrusible, jaws, each with three incurved teeth 

 at its apex and two smaller teeth at its sides. Oesoph- 

 agus with an anterior swelling but without posterior bulb. 

 Caudal end of male apparently with two small preanal supple- 

 mentary organs. Spicules stout, straight to near the tips, 

 where they are bent ventrally at an obtuse angle. Apparently 

 no accessory piece. Female genital tubes probably paired, 

 opposed, reflexed. Spinneret present. 



Hab. Marine. 



Genotype : S. obtusum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 290 and key. 



3. Triodontolaimus de Man, 1893, nee Micoletzky, 1913. 

 Cuticle unstriated and without bristles. Head rather distinct, 

 with three inconspicuous lips and a crown of ten short, thick 



SYN. NEM. L 



