296 OLIGOCHAETA 



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

 CUtelUo arenarius by Vaillant. Having myself investigated CUtellio arenarius of Clapae4;de (3), 

 I can state positively that it is not identical with Faranais Uttoralis of Boubne. Zengee's Peloryctes 

 inquilina 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 hyalinus,' 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 Monopylephorus rubroniveus of Levinsen ; I am disposed 

 to regard this as congeneric with Bothrioneuron of Stolc. As there is nothing in Czeeniavsky's 

 definition of the genus Faranais, or of the species P. Uttoralis to warrant its identity with the species 

 described by Bourne under the name of Faranais Uttoralis, I venture to use the generic name Uncinais 

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



CZEENIATSKY. 



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

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

 ■Levinsen. 



' Alle B0rsterne Krogbi^rster . . . Rygb(^rstEr mangle i de f(^rste 3 b^rstebserende Ringe ; kun 

 fi^rste Rings Burster tydelig laengere end de 0vrige 5-6 i hvert Bundt, senere 3-4; c^verste 

 B^rstegren noget smallere end nederste.' 



(3) Uncinais uncinata (Oehsted), 



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



Enchytraeus triventralo-pectinatus, Minor, Am. Journ. Sci. Arts, xxxv, J 863, 



P- 35- 

 Faranais uncinata, CzEENiAVSKT, Bull. Soc. Nat. Mosc, 1880, p. 311. 

 Ophidonais uncinata, Vejdovsky, Syst. u. Morph., 1884, p. 24. 

 Uncinais uncinata, Levinsen, Vid. Med., 1884, p. a 18. 



Definition. Length, 1 1 mm. ; number of segments, 2(^-25. Setae four in each bundle, always of 

 the same size. Hab. — Europe ; America. 



Genus Bohemilla, Vejdovsky. 

 Syn. Nais, Timm. 



DEFiBTiTiOKr. 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. 

 Nais hamata, Timm, Arb. Zool. Zoot. WUxzb., 1883, p. 152. 



