DESMODORINAE 129 



1. Desmodora de Man, 1889. 



Syn. Chromadoropsis Filipjev, 1918 ; Metachromadora Filip- 

 jev, 1918 ; Amphisjnra Cobb, 1920 ; Cinctonema Cobb, 1920 ; 

 Micromicron Cobb, 1920; Acanthonchus Cobb, 1920; Xeno- 

 nema Cobb, 1920; Steineria Filipjev, 1922, 7iec Micoletzky, 

 1923 ; Prodesmodora Micoletzky, 1923. 



Cuticle typically with prominent transverse annulations, 

 except at the extremities, and with fine bristles. Head 

 usually somewhat swollen, smooth, with very small papillae 

 and one or two crowns of small bristles. Lateral organs 

 large, spiral or circular. Pharynx small, consisting of a wider 

 anterior portion with folded waUs and containing a dorsal 

 tooth, and a narrower posterior portion passing into the oeso- 

 phageal lining. Oesophagus with a posterior bulb. Caudal 

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

 Two accessory pieces present. Testis single, outstretched. 

 Body of female swollen in region of genital organs. Female 

 genital tubes paired, opposed, reflexed. Caudal glands and 

 spinneret present. 



Hab. Usually marine. One species in soil. 



Genotype : D. [Spilopliora] communis (Biitschli, 1874). 



Biitschli, 1874, Abh. Senckenb. Oes., Frankfurt a. M., ix, 

 282 ; de Man, 1889, Mem. Soc. Zool. France, iii. 9. 



Xenonema and Prodesmodora are both described from single 

 female specimens, Micromicron, Cinctonema and Steineria 

 from single males, and Amphispira from an immature speci- 

 men of unknown sex. The few characters in which these 

 forms differ from the type of Desmodora appear too slight to 

 warrant their separation from that genus. The same observa- 

 tion applies to Metachromadora and Chromadoropsis. 



2. Odontolaimus de Man, 1880. 



Syn. Neonchus Cobb, 1893. 



Cuticle very finely striated, with scattered bristles. Head 

 without lips or papillae, but with ten bristles. Lateral 

 organs circular. Pharynx a very long, slender tube, decreas- 

 ing in diameter posteriorly and with somewhat thickened 

 dorsal wall; preceded by a thin-walled " vestibule " contain- 

 ing a triangular dorsal tooth. Oesophagus with a fusiform 

 pharyngeal swelling and a sudden, bulb-like, posterior swelling. 

 Male unknown. Female genital tubes apparently paired. 

 I Caudal glands absent. 



I Hab. Soil. 



Genotype : 0. chlorurus de Man, 1880. 



de Man, 1880, Tijdschr. Ned. dierk. Vereen., Leiden, v, 61 ; 

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



SYN. NEM. K 



