OLIGOCHJETA 313 



Key to the American species of Lumhricus : 



Oi Clitellum on segments 31 or 32 to 37 L. tereestbis 



©2 Clitellum on segments 2G or 27 to 32 L. rubellus 



Og Clitellum on segments 28 to 33 L. castaneus 



L. terrestris L. (Fig. 478). Length up to 30 cm,y 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 (Allolohophora %• 

 Eisen) (Fig. 494). Peristomium incom- 

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



pairs of vesiculae seminales which do Fig. 493 — Diagram showing 



. „ . ., • ,1 • 1 n T r» completely divided peristomium 



not luse together m the middle line; 2, (Sussw. F. Deut.). l, prosto- 



^ • ,1 • i. o 4- mium ; 2, peristomium. Fig. 494 



or 3 pairs spermathecae m segments 8 to —Diagram showing incompletely 

 -,,,•1 J Tj-in • o divided peristomium (Siissw. F. 



11; tail end cylindrical: 9 species, 6 Deut.). 

 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 Avorm 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 [Allolohophora 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 spermathecae: 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 ; 



