108 ASCAROIDEA 



Hab. Marine. 



Genotype : D. minutus Claparede, 1863. 



Claparede, 1863, Beobachtungen ilb. Anat. u. Enlwick- 

 liingsges. wirbelloser Thiere, etc., Leipzig, 89 ; Schepotieff, 1908, 

 Zeitschr. f. tviss. Zool., xc, 181 ; Steiner, 1916, Zool. Anz., xlvii, 

 324; Filipjev, 1922, Act. Inst. Agronom. Stauropol., i (16), 150. 



The chief character in which Quadricoma is said to differ 

 from Desmoscolex is the larger number of annulations on the 

 cuticle (seventeen or eighteen in Desmoscolex, thirty-three to 

 seventy-six in Quadricoma, according to Filipjev). We are 

 iniable to accept this as a generic character, and therefore 

 regard Quadricoma as a sjmonym of Desmoscolex. 



2. Tricoraa Cobb, 1894. 



Like Desmoscolex, but with the clear interspaces of cuticle 

 greatly reduced, almost the whole surface of the body being 

 occupied by the opaque rings. Body with bristles in " cycles " 

 of three in the genotyjje. Lips conical, flanked by cuticular 

 " cephalic alae," and each bearing a bristle at its base. 



Hab. Marine. 



Genotype : T. cincta Cobb, 1894. 



Cobb, 1894, Proc. Linn. Soc. N.S.W., Sydney, (2) viii, 389; 

 Steiner, 1916, Zool. Anz., xlvii, 324; Filipjev, 1922, Act. Inst. 

 Agronom. Stauropol., i (16), 155. 



Cobb's description of the genotype was drawn up from 

 memory, with the help of two drawings, the tjrpe having been 

 lost. The genus is upheld by Filipjev, who has ascribed 

 other species to it. The differences from Desmoscolex appear, 

 however, to be very slight, and it is not improbable that 

 Tricoma should be regarded as a synonym. 



3. Eudesmoscolex Steiner, 1916. 



Opaque rings on cuticle, as in Tricoma, not separated by 

 clear interspaces. Bristles in two subdorsal rows of nine 

 each. Lips apparently absent. 



Hab. Marine. 



Genotype : E. oligochaetus Steiner, 1916. 



Steiner, 1916, Zool. Anz., xlvii, 324; 1916, Zool. Jahrb., 

 Syst., xxxix, 579. 



Here, again, the differences from Desmoscolex are slight, 

 and the genus appears of somewhat doubtful validity. 



4. Greefflella Cobb, 1922. 



Syn. Trichoderma Greefif, 1869, 7iec Steph., 1835. 



Head distinct, rounded, with two crowns of bristles. 

 Lateral organs present. Cuticle of body very coarsely 



