CYLINDROLAIMINAE 49 



like papillae. Lateral organs circular. Buccal capsule shaped 

 like a slender, inverted funnel, and resembling a " stylet." 

 Oesophagus swollen in front and behind, without bulb. Caudal 

 end of male with a median preanal series of numerous papillae. 

 Spicules slender. An accessory piece, with two oblique 

 posterior processes, present. Female genital tube single, 

 anterior. Caudal glands present. 



Hab. Marine. 



Genotype : S. niger de Man, 1893. 



de Man, 1893, Mem. Soc. Zool. France, vi, 99 ; zur Strassen, 

 1904, Zool. Jahrb., Suppl. vii, 302; Steiner, 1916, Zool. Jahrb., 

 Sysf., xxxix, 631. 



3. Chromagaster Cobb, 1894. 



Cuticular striations, if present, very fine. Bristles present 

 throughout the body, but conspicuous only towards the 

 I extremities. Cephalic bristles present, in two crowns. Neck 

 constricted behiiid the lateral organs. Lips inconspicuous, 

 sometimes six in number. Buccal capsule short, narrow and 

 tubular. Oesophagus club-shaped, gradually expanding into 

 a bulb. Tail of male conical. Spicules equal, slender. Two 

 accessory pieces, somewhat L-shaped. Testis single. Vulva 

 not conspicuous. Female genital tube single, outstretched. 

 Caudal glands absent. 



Hab. Marine, in mud or sand. 

 Genotype : C. purpurea Cobb, 1894. 



Cobb, 1894, Proc. Linn. Soc. N.S.W., Sydney, viii, 416; 

 Steiner, 1916, Zool. Jahrb., Syst., xxxix, 633. 



According to Steiner (1916) Chromagaster nigricans, the 

 second species of this genus, is to be referred to Siphonolaimus 

 de Man, but it is uncertain whether the genotype of Chroma- 

 gaster is also a Siphonolaimus. The genus Chromagaster is 

 therefore retained. 



4. Camacolaimus de Man, 1889. 



Syn. Acontiolaimus Filipjev, 1918. 



Cuticle striated. Short cephalic bristles present. Lateral 

 organs circular, or incipient spirals. Buccal capsule small, 

 thickened on the dorsal side to form a rod-shaped chitinoid 

 structure or a " claw-shaped mobile tooth " (Filipjev). Oesoph- 

 agus without bulb. Tail of male without preanal papillae. 

 Two equal spicules and a small accessory piece. Female 

 genital tubes symmetrical and reflexed. Caudal glands 

 present. 



Hab. Marine. 



Genotype : C. tardus de Man, 1889. 



SYN. NEM. E 



