78 ASCAROIDEA 



without papillae. Accessory piece single, flattened and 

 shield-shaped. Female genital tube single, anterior. Caudal 

 glands present. 



Hab. Marine. 



Genotype : S. hirsutus Bastian, 1865. 



Bastian, 1865, Trans. Linn. Soc. London, xxv, 157 ; de Man, 

 1884, Diefrei . . . lebenden Nematoden d. Niederl. Fauna, 71. 



6. Didelta Cobb, 1920. 



Cuticle unstriated, without bristles, but with transversely 

 elongated, refractive, bubble-like markings. Head with four 

 long and six short bristles. Lateral organs large, longi- 

 tudinally elliptical, " really spiral." Buccal capsule somewhat 

 asymmetrical, goblet-shaped, its wall shorter dorsaUy than 

 ventrally. Oesophagus somewhat narrower posteriorly. Male 

 unknown. Female genital tubes paired, opposed, outstretched. 

 Spinneret absent. 



Hab. Marine. 



Genotjrpe : D. maculatum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 252 and key. 



7. Desmolaimus de Man, 1880. 



Cuticle smooth or striated, without bristles or lateral alae. 

 Head not distinct, without lips, with or without bristles. 

 Lateral organs, when present, circular. Buccal capsule cup- 

 shaped, with thin walls having thi'ee parallel annular thicken- 

 ings or ridges, of which the innermost encircles the base of the 

 caj)sule. Oesophagus expanded behind its middle into a 

 large bulb with widened lumen, and again somewhat enlarged 

 posteriorly, but not forming a distinct muscular bulb. Caudal 

 end of male without papillae, but with several bristles. 

 Spicules small, curved. The large accessory piece has two 

 posterior processes. Female genital tubes paired, opposed, 

 outstretched. 



Hab. Soil or water (fresh or brackish). 

 Genot3rpe : D. zeelandicus de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 14; 

 1884, Diefrei . . . lebendeii Nematoden d. Niederl. Fauna, 50; 

 Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 84. 



8. Myolaimus Cobb, 1920. 



Cuticle finely striated, without bristles or lateral alae. 

 Head with confluent lips and two crowns of bristles. Lateral I 

 organs faint transverse slits. Buccal capsule cup-shaped, f 

 with oesophageal teeth projecting at its base. Between the 

 buccal capstde and the oesophagus is a pharynx surrounded by 



