596 DR. p. E. BEDBARD ON 



The excretory vessels consist of the usual dorsal and ventral tubes 

 running continuously through the strobila. Anterioi'ly there is 

 less difference in the calibre of these tubes than posteriorly. The 

 position in relation to each other also becomes altered . In immature 

 segmetits (where I have studied the excretory tubes) the rather 

 smaller dorsal vessel lies obliquely above the ventral vessel to the 



Text-fig. 80. 



-(/. V 



.^ I- •• i 



\ "^t: 



Syracotcenia lujracis. 



Transverse section through a proglottid. 



d.v. Dorsal excretory' tube. T. Row of testes. V. Vitelline gland. 

 v.v. Ventral excretory tube. 



pore side of the same. In maturer proglottids the two vessels are 

 practically superposed, and the dorsal vessel is at times so minute 

 as to escape observation. Both of these vessels are connected 

 with a network of larger and smaller wEtter vascular capillaries 

 which traverse the medullary region of the body. I have seen 

 branches of these ending in a testis, and it becomes a matter of 



