OLIGOCH&TA 313 



Key to the American species of Lumbricus : 



G! Clitellum on segments 31 or 32 to 37 L. TEBRESTRIS 



o 2 Clitellum on segments 26 or 27 to 32 L. RUBELLUS 



a a Clitellum on segments 28 to 33 L. CASTANEUS 



L. terrestris L. (Fig. 478). Length up to 30 cm., with about 180 

 segments; color purplish; clitellum on segments 31 or 32 to 37: in wet 

 places; Europe and America. 



L. rubellus Hoffmeister. Length up to 15 cm. with about 150 seg- 

 ments; color pink; clitellum on segments 26 or 27 to 32, usually nearly 

 in center of body : in wet places ; cosmopolitan. 



L. castaneus (Savigny). Length up to 5 cm. with about 90 seg- 

 ments; color chestnut or violet brown, strongly iridescent; clitellum 

 on segments 28 to 33: America and 

 Europe. 



2. EISENIA Malmgren (Allolobophora 

 Eisen) (Fig. 494). Peristomium incom- 



pletely divided by prostomium ; 3 or 4 Fig. 493 Fig. 494 



pairs of vesiculae seminales which do Fig 493 Diagram showing 



not fuse together in the middle line; 2 ?$$?**. 



or 3 pairs spermathecae in segments 8 to 



11; tail end cylindrical: 9 species, 3 {$! P erist mium < Siissw - F - 



American. 



E. foetida (Savigny). Length up to 9 cm. with about 100 segments; 

 color pink with a dark ring on each segment; clitellum on segments 24, 

 25, or 26 to 32; setae strictly in pairs; 2 pairs spermathecae, in segments 

 9 and 10: the worm lives often in manure and has a disagreeable odor; 

 cosmopolitan. 



E. rosea (Sav.). Length up to 6 cm. with about 150 segments; 

 color red; clitellum on segments 24, 25, or 26 to 32; 2 pairs of sper- 

 mathecae in segments 10 and 11; setae strictly paired: in wet places; 

 cosmopolitan. 



3. HELODRILUS Hoffmeister (Allolobophora Eisen). Peristomium 

 incompletely divided by prostomium (Fig. 494) ; 2 to 4 pairs vesiculae 

 seminales which do not fuse together in the middle line; tail end cylin- 

 drical: 54 species, 10 American. 



H. caliginosus (Savigny). Length up to 17 cm. with about 250 nar- 

 row segments ; color very variable, being gray, pink, yellowish, or bluish, 

 but never purple; clitellum on segments 27 or 28 to 35; setae strictly 

 paired; 4 pairs vesiculae seminales; 2 pairs spermatheeae : in fields and 

 gardens ; cosmopolitan. 



H. chloroticus (Sav.). Length up to 6 cm. with about 125 seg- 

 ments; color variable, but never purple; clitellum on segments 29 to 37; 



