THE EARTHWORM 



29 



Fig. 6 



A series of diagrams to illustrate the arrangement or the blood-vessels and the course 

 of the circulation in Lumbricus hcrculius. A. Longitudinal view of the vessels 

 in somites 8, 9 and 10. B. The blood-vessels as seen in transverse section in. 

 the same region. C. Longitudinal view of the vessels in the intestinal region. 

 D, Transverse section through the intestinal region, sp, supra-intestinal ; sl>, 

 sub-intestinal, and sn, sub-neural longitudinal trunks ; /, lateral neural vessels ; 

 ht, At, 'contractile vessels or "hearts"; it, intestino-tegumentary vessels ; cv, 

 commissural vessels ; a/.z, afferent intestinal vessels ; ef.i, efferent intestinal 

 vessels ; ty, typhlosolar vessel ; /, intestine ; ae, oesophagus ; s,s, septa. (From a 

 drawing by Dr W. B. Benham.) 



