216 Givynneth Buchanan: 



The ventral vessel is also single, sending branches to the ali- 

 mentary canal in the segments anterior to 4, and to the ventral 

 body wall from 6 to 1. in which it breaks up. From the anterior 

 end of 10 passing backwards, it gives branches to the ventral 

 body wall, especially well-marked in 10, 11 and 12. 



There is apparently no supra-intestinal, but in 10, 11 and 

 12 is a short transverse vessel, which is the main origin of the 

 hearts. There is a well-marked branch from this vessel in each 

 segment, also to the calciferous glands, which is connected with 

 the lateral ; and vessels pass to the dorsal surface of the ali- 

 mentary canal, running forward in each of the three segments, 

 but with no definite connection with the transverse vessel of 

 the next. Even in sections, ^vhich show the blood supply is 

 thick above the alimentary canal, no definite supra-intestinal 

 can be made out ; the only approach to it being between 12 and 

 13, wlipi-e a median vessel, apparently taking origin from the 

 irregular blood spaces and in connection with those of the calci- 

 ferous glands of each side, passes forwards to unite with the 

 transverse of 12. 



The lateral arises from the commissural in 5 on each side, 

 and runs forward to break up on the anterior septum of that 

 segment, passing back to join its fellow at the posterior end of 

 9. through (in one specimen) a glandular organ, from whence 

 it runs on as a single ,^uh-intestinal, dividing again at the 

 hinder end of 12, and ending on the posterior septum of 13. 

 From 5-9 its branches pass to the alimentary canal and posterior 

 septum of each segment, the latter vessel having in most cases, 

 as stated, a curious connection with the commissurals which 

 seems to onlv involve the outer coats of the vessels. 



.").- -Cryptodpilus grand is, Fletcher. Proc. Linn. Soc. 

 N.S.W., 1887. 

 Notoscolex grand is, Fletcher. 



Plate XLT., Fig. r>. 



JJlssertion. -Dorsal vessel single, very slightly swollen in the 

 heart region, running forwards to segment 1, where it divides 

 to two, one passing round to join the ventral on each side. 



