LUMBRICUS. 203 
LUMBRICUS (Ist twenty segments). 
NERV EXCRETORY | REPRODUCTIVE 
SEGMENTS. | APPENDAGES.| Sv0 Ae SEE CREA. APERTURES. 
Prostomium. | Brain. Mouth. 
Peristomium I Nerve-ring. 
2 Setee, Ganglion. Nephridio- 
3 " " Pat pores 
4 ” " Nephridium 1 (same as 
5 " " " nephridia). 
6 " " " 
7h " " " 
8 " n" nW 
9 u " " Spermatheca. 
Spermathecal. 
Io " " " Sperm. Testis. 
Spermathecal. 
1 " " " Testis. Dorsal pore. 
I2 " tt " " 
.13 " " " Ovary. " 
14 " " " Oviducts. tt 
15 " " u " 
16 " " " 9 ap. wu 
17 " " " 6 ap. u 
18 it " tt " 
19 " " tt 
20 1 " " u 
&c. 
(For the general characters of the Sub-Phylum Annelida, 
see page 238.) 
