ANATOMY OF CESTODES. 



185 



of the tube, which is like that of the water-vascular vessels. I 

 may add to these arguments the additional one that even in 

 fully mature proglottids— proglottids at a,ny rate in which the 

 uterus is fully developed though not yet distended with ova— this 

 vertical tube is of the same dimensions as in earlier segments. 

 If a part of the generative system, some change would have been 

 expected in this tube associated with the general maturity of the 

 proglottid. 



Text-figure 6. 



CO 



Diagrammatic representation of water-vascular system of Amabilia, for 

 purposes of comparison with a Ctenophore. 



c. Cirrus-sacs (possibly comparable to tentacles of a Ctenophore). I. Lateral vessels. 

 t. Transverse vessels, p. One of two pores of dorso-ventral tube. 



I may finally point out in reference to the water-vascular 

 system of Amabilia, but without going into further detail, the 



