66 ALFRED GIBBS BOURNE. 



iiitestino-tegumeutary vessels. The hinder branch comes 

 into relation in this way with that branch of the anterior 

 iutestino-tegumentary vessel which lies on septum vi . vii. 



The hearts of segment vii are of nearly twice the length of 

 those of segment vi. They also give off two branches from 

 the extremity beyond the muscular bulb ; the one branch has 

 relations similar to those described above with the branch of 

 the intestino-tegumentary vessel which lies in septum vii . 

 VIII, and the other joins the similar branch from the heart of 

 segment viii and goes to the gizzard, where it, like the cor- 

 responding branch of the heart of segment vi, is in communi- 

 cation by means of a capillary network with the intestino- 

 tegumentary vessel. 



The hearts of segment viii are directly connected with the 

 ventral vessel, but between the muscular bulb and this point of 

 connection give off two branches, one of which is mentioned 

 above, and the other has corresponding relations with the 

 branch of the intestino-tegumentary vessel which lies on 

 septum VIII . IX. 



The five succeeding pairs of hearts are all latero-intestinal. 

 Those of segment ix join the ventral vessel ; but, as in the 

 case of the hearts of the preceding segment, there is a certain 

 length of vessel between the end of the heart, as marked by 

 the muscular bulb and the ventral vessel ; from this portion 

 arises one branch only, which has the usual relations with a 

 branch of the intestino-tegumentary vessel — that which lies on 

 septum IX , X. There is no branch to the gizzard-wall ; we 

 are now behind that region. All these arrangements are shown 

 in fig. 4. 



All the segmentally arranged capillary networks with which 

 the hearts and intestino-tegumentary vessels communicate, as 

 described above, extend over the body-wall in their own 

 neighbourhood. 



The hearts of segments x — xiii have relations precisely 

 similar to one another. Each is connected at its proximal 

 extremity by a vessel much narrower than itself with the dorsal 

 vessel, and by another narrow vessel with the supra-intestinal 



