338 



THE EARTHWORM 



wards in the dorsal, backwards in the ventral vessel. The 

 series of vessels of the enteric canal are connected with the 



1.3 



FIG. 83. Blood-vessels of A llolobophora. Dissections from the left side of A, the 

 twelve anterior segments, and B, three segments in the intestinal region. 

 The arrows indicate the course of the circulation. (From Howes's Atlas.'} 



be, buccal sac ; c.l, nerve-cord ; cm, commissural vessels connecting the dorsal and 

 subneural vessels; cm', neural commissural vessels; c.m, mesentery, and ex, 

 vessel of nephridium ; g.c, cerebral ganglion ; g.n, ganglionic swelling of nerve- 

 cord ; h, commissural vessels (" hearts") connecting the dorsal and subintestinal 

 vessels anteriorly ; /'./, lateral intestinal vessels ; z, intestine ; i.s, dorsal (supra- 

 intestinal) vessel ; m.s, septum ; n.a, ventral perforation of septum ; n.l, lateral 

 neural vessel ; n.s, subintestinal vessel ; n.s' , subneural vessel ; as, gullet ; ce.g, 

 oesophageal pouch ; ce.l, lateral cesophageal vessel \ph, pharynx ; sg, nephridium. 



dorsal and sub-intestinal trunks, and those of the excretory 

 organs, to be described presently, with the sub-intestinal 



