NBW ASEXUAL TAPEWORM. 



833 



this line is the longer diameter of the cross-section ; the tubes 

 etc, are thus laterally disposed with regard to each other. It is 

 necessary to emphasise what may appear to be a statement of the 

 obviously true, since in other regions of the body the mutual 

 relationships of these several organs and systems are a little 

 changed. 



Text-fiff. 116. 



Transverse section through middle of strobila of oldest bud of the asexual 

 form of Uroci/stidium gemmiparum. 



l.v. Excretory tubes, n. Nerve-cord. x. Tube of doubtful significance 

 described in text. 



In all other tapeworms known to me the water vascular tubes 

 of the two sides of the body are symmetrical with each other in 

 point of position within the medulla and distance from the latei'al 

 cortex on either side. They are also generally correspondent in 

 size, though not always regularly so throughout the whole body. 

 In the present species the water vascular tubes are asymmetrical in 

 both these particulars. The tube of the one side is considerably 



