250 



the segments of 

 the muscular en- 

 velope by separate 

 veins (p p) ; and 

 thus the blood 

 from all parts is 

 brought to the 

 gills and exposed 

 to the influence of 

 oxygen. 



(653.) After un- 

 dergoing respira- 

 tion, the blood is 

 collected from the 

 branchial plexuses 

 by the lateral veins 

 (rrr), from which, 

 through commu- 

 nicating vessels 

 (s s s), it passes 

 into the aorta or 

 great dorsal vessel 

 (t t t) to be dis- 

 tributed through 

 the body. From 

 the aorta large 

 trunks (v v) are 

 given off to form 

 the intestinal ar- 

 tery (w w), which, 

 ramifying over the 

 intestine, commu- 

 nicates with the in- 

 testinal vein (n n) 

 and thus com- 

 pletes the vascular 

 circle*. 



(654.) In Eunice 

 sanguinea the cir- 

 culatory apparatus 

 consists of a short 

 but capacious dor- 

 sal vessel (fig. 

 123, l') t which 



ANNELIDA. 



Fig. 122. 



Circulatory system of Amphinome capillata. 



7 / ' 



The parts indicated in the drawing by letters not referred to in the text are the 



