296 OLIGOCHAETA 



The synonymy of this species is a matter of great difficulty. It has been confounded with 

 Clitellio arenarius by VAILLANT. Having myself investigated Clitellio arenarius of CLAPAHEDE (3), 

 I can state positively that it is not identical with Paranais littoralis of BOURNE. ZENGER'S Peloryctes 

 inguilma being probably synonymous with Hemitubifex benedii, must also be removed from VAILLANT'S 

 list. As D'UDEKEM would hardly have overlooked a cephalization in his ' Tubifex Jiyalinus,' if it existed, 

 it is probably safe to remove this species also from the list; it is indeed queried by VAILLANT. 

 Another synonym queried by VAILLANT is Monopylephoms rubroniveus of LEVINSEN ; I am disposed 

 to regard this as congeneric with Bothrioneuron of STOLC. As there is nothing in CZERNIAVSKY'S 

 definition of the genus Paranais, or of the species P. littoralis to warrant its identity with the species 

 described by BOURNE under the name of Paranais littoralis, I venture to use the generic name Uneinais 

 of LEVINSEN, the definition of which does fit in. The following are the definitions referred to. 



CZERNIAVSKY. 



'Setarum fasciculi utrimque bi-seriati, omnes et superiores et inferiores setis uncinatis formati. 

 Corpus lineare teres, postice subtruncatum. Ocelli duo vel nulli.' 

 LEVINSEN. 



' Alle B^rsterne Krogb^rster . . . Rygb^rster mangle i de f^rste 3 bi^rstebserende Ringe ; kun 

 f$rste Rings Burster tydelig laengere end de <vrige 5-6 i hvert Bundt, senere 3-4; <verste 

 B^rstegren noget smallere end nederste.' 



(2) Uneinais uncinata (OEHSTED). 



Nais uncinata, OERSTED, Nat. Tidsskr. 1842, p. 136. 



Enchytraeus triventralo-pectinatus, MINOR, Am. Journ. Sci. Arts, xxxv, 1863, 



P- 35- 



Paranais uncinata, CZERNIAVSKY, Bull. Soc. Nat. Mosc., 1880, p. 311. 

 Ophidonais uncinata, VEJDOVSKY, Syst. u. Morph., 1 884, p. 24. 

 Uneinais uncinata, LEVINSEN, Vid. Med., 1884, p. 218. 



Definition. Length, i 1 mm. ; number of segments, 20-25. Setae four in each bundle, always of 

 the same size. Hob. Europe ; America. 



Genus BOHEMILLA, VEJDOVSKY. 

 Syn. Nais, TIMM. 



DEFINITION. Dorsal setae begin on segment V; the longer dorsal setae serrated. 

 Eyes present. 



This genus, instituted by VEJDOVSKY, seems to be a perfectly good one. It only 

 contains one species, viz. 



Bohemilla comata, VEJDOVSKY. 



B. comata, VEJDOVSKY, SB. Bohm. Ges. 1883, p. 218. 

 BTais hamata, TIMM, Arb. Zool. Zoot. Wurzb., 1883. p. 152. 



