DORYLAIMINAE 7l 



1913, Journ. Washington Acad. Sci., iii, 432-444; 1920, Contr. 

 Sci. Nematol, ix, 303, 305; Micoletzky, 1922, Arch. f. Naturg., 

 Abt. A, Ixxxvii, 434, 53.5. 



Antholaimus and Nygolaimus are regarded, probably rightly, 

 by Micoletzky (1922) as synonyms of Dorylaimus. Actino- 

 laimus, according to Cobb (1918, in Ward and Whipple, 

 Freshwater Biology, 485), was " proposed for species similar 

 to Dorylaimus labyrinthostomus , in which the phar3mx is more 

 or less immobile, radially striated and elaborately constructed." 

 According to Micoletzky, Actinolaimus differs from Dorylaimus 

 only in having a very large " vestibule " with thick, chitinized 

 wails. This character, however, is evidently subject to some 

 variation, and its generic value seems questionable. We have 

 also included in the synonymy five other names proposed for 

 forms showing slight peculiarities in the form of the stylet 

 or of the oesophagus, which have been treated by Micoletzky 

 as subgenera of Dorylaimus. 



2. Trichodorus* Cobb, 1913. 



Syn. Leptonchus Cobb, 1920. 



This genus apparently very closely resembles Dorylaimus, 

 from which it differs chiefly in the following characters : — 

 Lateral organs stirrup-shaped. Stylet very long, asym- 

 metrical, bent dorsally, with a cap-like chitinoid structure 

 anteriorly. Testis single, outstretched. 



Hab. Soil. 



Genotjrpe : T. [Dort/laimus] primitivus (de Man, 1884) 

 (= T. obtusus Cobb, 1913). 



de Man, 1884, Die frei . . . lebenden Nematoden d. Niederl. 

 Fauna, 162 ; Cobb, 1913, Journ. Washington Acad. Sci., iii, 

 434, 441; 1920, Contr. Sci. Nematol, ix, 304; Micoletzky, 

 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 539. 



3. Carapydora Cobb, 1920. 



Cuticle unstriated, without bristles, with eight longitudinal 

 striations, becoming more marked and almost like alae in the 

 neck region. Head truncate, with six lips and two crow^ls of 

 six and twelve papillae respectively. Lateral organs elliptical. 

 Stylet bent dorsally in front, its base not knobbed. Oesoph- 

 agus expands suddenly behind into a distinct cylindrical 

 bulb. Male unknown. Female genital tube single, anterior, 

 reflexed. Spinneret absent. 



Hab. Soil. 



Genotype : C. demonstrans Cobb, 1920. 



* Cobb (1913) uses the name Trichodora in the key at p. 434, changing 

 it to Trichodorua on p. 441. 



