TRILOBIDAE 77 



2. Paratrilobus Micoletzky, 1922. 



Head with short bristles. Buccal capsule weU-chitinized, 

 j somewhat barrel-shaped, with longitudinal ribs in its waU. 

 Its wall appears jointed dorsally as seen in lateral view. 

 Oesophagus with three teeth at its anterior end in immediate 

 connection with the buccal capsule. Caudal end of male with 

 six large preanal papiUae. Remaining characters as in 

 Trilobus. 



Hab. Marine. 



Genot37pe : P. grandipapiUoides Micoletzky, 1922. 



Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 187, 188. 



3. Choanolaimus de Man, 1880. 



Cuticle striated, with granular sculpture, without bristles 

 or lateral alae. Head not distinct, with two circumoral crowns 

 of papillae but without bristles. Lateral organs large, spiral. 

 Buccal capsule large, consisting of an anterior funnel-shaped 

 portion, with walls composed of longitudinal rods, and a narrow 

 posterior portion. Oesophagus cylindrical, slightly swollen 

 behind. Caudal end of male without papillae. Two rod- 

 shaped accessory pieces present. Female genital tubes paired, 

 opposed, reflexed. Caudal glands and spinneret absent. 



Hab. Soil. 



Genotype : C. psammophilus de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 28; 



1884, Die frei . . . lebenden Nematoden d. Niederl. Fauna, 

 72; Micoletzky, 1922, Arch.f. Naturg., Abt. A, Ixxxvii, 193. 



4. Anoplostoma Biitschli, 1874. 



Cuticle unstriated, usually with bristles. Head rather 

 distinct, with a cro-«ai of bristles. Lateral organs variable. 

 Buccal capsule very large, cup-shaped. Oesophagus swollen 

 posteriorly. Caudal end of male typically with slight alae 

 and papiUae. An accessory piece present. Female genital 

 tubes paired. Caudal glands present. 



Hab. Marine. 



Genotype : A. [Symplocostoma] viviparum (Bastian, 1865). 



Bastian, 1865, Trans. Linn. Soc. London, xxv, 133 ; Biitschli, 

 1874, Abh. Senckenb. Ges., Frankfurt a. M., 272; de Man, 



1885, 3Iem. Soc. Zool. France, i, 17. 



5. Sphaerolaimus Bastian, 1865. 



Cuticle smooth or transversely striated, with many bristles. 

 Head distinct, with bristles. Lateral organs circular. Buccal 

 capsule large, sub-spherical, with linear parietal thickenings. 

 Oesophagus gradually swollen behind. Caudal end of male 



