NEW ASEXUAL TAPEWOEM. 



835 



by the fact that in two places, one behind the other, it communi- 

 cates with the exterioi^ by a narrow duct (text-fig, 117). One of 



Text-fig. 117. 



Two consecutive sections from another region of the same bud as that which is 

 represented in text-figure 116, to illustrate the opening of the tube x on to the 

 exterior. 



In the upper figure the orifice (o.) on to the exterior is shown and the 

 commencement of the invagination leading towards the tube x. 



In the lower figure the outgrowth of the tube x to meet the invagination is seen. 

 n. Nerve-cord. l.v. Water vascular tubes. 



