68 GtvijnncfJt Buchai)aii : 



the ventral, but that in 3 turns back and runs to the posterior 

 mesentery of 13 as the lateral, as far as 9, and afterwards as 

 suh-irifestinaJ, giving off in 4 a branch manning forward to seg- 

 ment 1. There is a very strongly marked development of 

 blood vessels on the uall of the alimentary canal in segment 5. 

 and in 7, 8 and 9 a branch arises from the supra-intestinal and 

 breaks up on the wall of the oesophagus. In segments 10, 11 

 and 12 this vessel joins the sub-intestinal. The hearts are 3 

 pairs, arising from the supra-intestinal posteriorly in segments 

 10, 11 and 12, and run round to join the ventral, which passes 

 along the whole length of the body, breaking up in segment 1. 



9. — Dipopachaeta richardi, .Spencer. 



Pepichaeta pichardi, Spencei-. P.R.8. Vict.. 19U0. 

 Plate XV., Fig. 9. 

 Dissection. — Dorsal vessel single, swollen in 13-15, and breaking 

 up in segment 1. At the posterior end it seems to be connected 

 as in other forms with the ventral, but the latter is here very 

 small. Professor Spencer (14) describes the dorsal as breaking 

 up in the second or third segment. The dorsal gives off a 

 supra-intestinal posteriorly in segment 12, which runs forward 

 to the front of 10; giving rise, in the hinder parts of segments 

 10, 11 and 12. to paii-s of hearts to join the ventral, and a vessel 

 on each side to the alimentary canal. In segments 5, 6, 7, 8 

 and 9, the dorsal gives off- conim issiirals, that in 5 sending a 

 branch Ijack as the lateral, at first and, later, as the sah- 

 intestinal on each side which receives branches in 10, 11 and 

 12 from the alimentary canal. If the dorsal gives off any vessels 

 in front of 5, they must be small, and break up soon. The 

 ventral runs forward to segment 5, where it breaks up. 



13. - Fletchepodpilus unicus, Fletcher. 



Cpyptodpilus fascial us, Fletcher, Proc. Linn. Soc. 

 IX.S.W., 1889. 



Plate XV., Fig. 10, and Plate X VIL, Figs. 21, 22, 23. 

 Dissection. Single dorsal vessel, very much swollen from 

 10-16, and running forward to divide into two in the posterior 



