ONCHOLAIMINAE 115 



surrounded by papillae. Lateral organs unknown. Buccal 

 cavity large, shaped somewhat as in Symplocostoma, with one 

 large and two small anteriorly-directed teeth. Oesophagus 

 gradually swollen behind, with a series of bulb-like expan- 

 sions. Caudal end of male with a median series of preanal 

 papillae. A slender accessory piece present, almost half as 

 long as the spicules, its lateral portions running out proximally 

 into a semicircular, anteriorly-directed hook. Female un- 

 known. Caudal glands present. 



Hab. Marine. 



Genotype : P. attenuata de Man, 1922. 



de Man, 1922, Tijdschr. Ned. dierk. Vereen., Leiden, (2) xviii, 

 131. 



11. Eurystomina Filipjev, 1921. 



I Syn. Eurystoma Marion, 1870, nee Rafinesque, 1818; 

 Amphistenus Marion, 1870; Marionella Cobb, 1922. 



Cuticle covered with very short, scattered bristles. Head 

 truncate, with a crown of long, slender bristles. Lateral 

 organs unknown. Pharynx spacious, armed with three 

 . chitinoid rods, each bearing a tooth anteriorly. Oesophagus 

 I relatively long, slightly swollen posteriorly. Two ocelli 

 I present. Caudal end of male with two large preanal supple- 

 I mentary organs. An accessory piece, with a long posterior 

 j process, present. Testes paired, opposed, outstretched. 

 I Female genital tubes paired, opposed, reflexed. Caudal 

 j glands and spinneret present or absent. 



Hab. Marine. 



Genotype : E. [Eurystoma] spectabile (Marion, 1870). 



> Marion, 1870, Ann. Sci. Nat., Paris, ZooL, xiii, 14, 19; 

 ' Filipjev, 1921, Trav. Lab. Zool., Stat. Biol. SebastojMl, Ser. II, 

 , No. 4, 568 ; Cobb, 1922, Contr. Sci. Nematol, xi, 353. 



We have included Amphistenus tentatively in the synonymy 

 of this genus. The males of the two species described by 



; Marion are still unknown. Cobb (1922) gives a somewhat 

 different account of the structure of the pharjoix from that 

 given above, but as he designates Eurystoma spectabile Marion 



I as genotype of Marionella, this is a synonym of Eurystomina. 



12. Phanoderma Bastian, 1865. 



Cuticle very transparent, unstriated or with longitudinal 

 markings. Head with bristles. Pharynx indistinct, with 

 obscure indications of three thickenings. Oesophagus swollen 

 behind, not distinctly muscular. Two large ocelli present. 

 Caudal end of male with a small supplementary organ. No 

 accessory piece. Female genital tubes paired, opposed. 

 Caudal glands and spinneret present. 



