THE EARTHWORM 



29 



Fig. 6 



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

 of the circulation in Luilihricus hcrcukus. A. Longltudmal view of the vessels 

 in somites 8 g and 10. B. The blood-vessels as seen m 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 .m, sub-neural longitudinal trunks ; nl, lateral neural vessels ; 

 ht ht, contractile vessels or "hearts"; it, intestino-tegumentary vessels ;cw, 

 commissural vessels ; a/.i, afferent intestinal vessels ; e/.t, efferent intestinal 

 vessels; /)/, typhlosolar vessel ; z, intestine ; <r, CESophagus ;.!■, J, septa, (from a 

 drawing by Dr W. B. Benham.) 



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