ALAIMIDAE 95 



Hab. SoU. 



Genotype : /. striatus Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 239 and key. 



9. Bastiania de Man, 1876. 



Cuticle striated, without bristles. Lateral alae absent. 

 Head not distinct, without lips, but with bristles. Lateral 

 organs spiral. Oesophagus elongate and gradually, but 

 slightly, swollen behind. Male with a ventral row of small 

 papilliform supplementary organs extending throughout the 

 greater part of the body. Spicules stout. No accessory 

 piece. Testes paired. Female genital tubes paired, sym- 

 metrical. Caudal glands and spinneret present. 



Hab. Soil. 



Genotype : B. gracilis de Man, 1876. 



de Man, 1876, Tijdschr. Nederl. dierk. Veree7i.,'s Gravenhage 

 and Rotterdam, 172; 1884:, Die frei . . . lebenden Nematoden 

 der Niederl. Fauna, 33; Micoletzky, 1922, Arch. f. Naturg., 

 Abt. A, Ixxxvii, 140. 



10, Deontolaimus de Man, 1880. 



Cuticle finely striated, without bristles or with few bristles. 

 Lateral alae sometimes present. Head not distinct, without 

 lips, but sometimes with fine bristles. Lateral organs absent. 

 Oesophagus swelling slightly and gradually behind. Male 

 with a row of ventral preanal papillae and one ventral post- 

 anal papilla. Spicules large. A smaU rod-shaped accessory 

 piece present. Testis single. Female genital tubes paired, 

 symmetrical. Caudal glands and spinneret present. 



Hab. Fresh or brackish water. 

 Genotype : D. papillatus de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 3; 

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

 31; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 141. 



11. Thalassoalaimus de Man, 1893. 



Cuticle unstriated, without bristles. Lateral alae appar- 

 ently absent. Head without lips, but with bristles. Lateral 

 organs small, probably in the form of transverse grooves. 

 Oesophagus slender, expanding posteriorly. Caudal end of 

 male with preanal papillae. Spicules short. An accessory 

 piece present. Female genital tube single, posterior, reflexed. 

 Caudal glands present. 



Hab. Marine. 



Genotype : T. tardus de Man, 1893. 



de Man, 1893, Mem. Soc. Zool. France, vi, 81. 



