ALAIMIDAE 93 



2, Alaimella Cobb, 1920. 



Cuticle coarsely striated, with bristles only at the ends. 

 Lateral alae apparently absent. Head not distinct, with 

 four bristles. Lateral organs circular, open behind. Lips 

 confluent. Oesophagus somewhat club-shaped. Spicules 

 slender. Two simple accessory pieces present. Testes paired, 

 parallel. Female genital tube probably single, posterior, 

 reflexed. Caudal glands and spinneret present. 



Hab. Marine. 



Genotype : A. truncata Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 234 and key. 



3. Anticoma Bastian, 1865. 



Cuticle unstriated, with small scattered bristles through- 

 out, and with special longitudinal rows of longer bristles, on 

 the lateral and sometimes on the submedian lines, in the 

 neck region. Head with ten bristles. Lateral organs slit- 

 like. Lips three, rudimentary, rarely with papillae. Oeso- 

 phagus club-shaped. Ocelli absent. Male without caudal 

 alae. A single sigmoid preanal supplementary organ present. 

 Caudal papillae, if present, inconspicuous. A few small 

 anal bristles present. Spicules equal. Testes paired, both 

 running anteriorly, but one usually reflexed near its end. 

 Female genital tubes paired, opposed, reflexed. Caudal 

 glands and spinneret present. 



Hab. Marine. 



Genotype : A. eberthi Bastian, 1865. 



Bastian, 1865, Trans. Linn. 8oc. London, xxv, 141 ; Cobb, 

 1890, Proc. Linn. Soc. N.S.W., Sydney, v, 765. 



4. Enchelidium Ehrenberg, 1836. 



Cuticle unstriated, with small, scattered bristles. Head 

 sometimes distinct, with a crown of bristles. Lateral organs 

 transversely elliptical. Lips indistinct. No buccal cavity. 

 Oesophagus gradually swollen behind, and surrounded near 

 its anterior end by a single large mass of pigment bearing 

 two, or rarely three, lenses. Caudal end of male usually 

 with a median series of preanal papillae. Spicules equal, 

 slender, slightly curved. 



Hab. Marine. 



Genotype : E. [Vibrio] marinum (Miiller, 1783). 



Muller, 1783, 163 {fide Stiles & Hassall, not verified); 

 Ehrenberg, 1836, Die Akalephen des Rothen Meeres, etc., 

 Abh. k. Akad. Wiss., Berlin, for 1835, 219, 235 (Sep. 1836, 41, 

 57) ; de Man, 1888, Mem. Soc. Zool. France, i, 12. 



