36 EARTHWORMS AND LEECHES [CH. I 



S. appendiculata (Udek). Yellowish. Skin covered with foreign 

 bodies and numerous papillae. Generally with 2 eyes. Total 

 segments 35 to 60. Length 10 to 20mm. In ponds. 



genus Stylaria Lm. Dorsal setae exclusively filiform, first on 

 segment 6. Prostomium produced, tentaculiform. 



S. lacustris (L.). Dorsal setae 1 long and 1 or 2 short per segment. 

 Eyes present generally. Total segments 25. Length 10 to 

 15 mm. 



genus Pristina Ehrbg. Dorsal setse exclusively filiform, first on 

 2nd segment. Prostomium produced. No eyes. Testes in 

 7th : ovaries in 8th (in P. leidyi : position in British sp. not 

 known). Fresh water. 



P. cequiseta Bourne. Filiform setae of 3rd segment not lengthened. 

 Total segments 18 to 21. Length 7 to 8 mm. Botanic Gar- 

 dens, probably introduced. 



P. longiseta Ehrbg. Filiform setae of 3rd segment enormously 

 prolonged. Total segments 17 to 20. Length 8 mm. 



Family TUBIFICID^E. Prostomium rounded. Setae in four groups, 

 two dorsal, two ventral. Ventral setae hooked, simple or two- 

 pronged : dorsal setae various. One pair of internal seminal 

 funnels in segment in front of male aperture. Male apertures 

 paired, in llth segment generally, 12th sometimes. One pair 

 of spermathecal apertures, a segment in front or a segment 

 behind male aperture ; seldom absent. One pair of testes in 

 segment in front of male aperture. One pair of ovaries in same 

 segment as male aperture. 



genus Branchiura Beddard, em. Mchlsn. Spermathecal in seg- 

 ment 10, male apertures in segment 11. Dorsal setae filiform 

 as well as hooked (simple or forked) or fan-like. Male 

 aperture in llth segment. No penis. Spermatophores not 

 formed. Fresh water. 

 B. coccinea (Vejd). Bright red. No branchiae. In clean, running 



water. 



B. sowerbyi Beddard. Branchiae on last fifty to eighty segments. 

 Length 38 to 50 mm. In mud of Victoria-regia tank ; 

 introduced. 



