1006 MR. F. E. BEDDARD ON 



parenchyma, a new set of muscular fibres becomes apparent which 

 I have not observed in the anterior segments and which therefore 

 if really present are not so plain in those segments. The fibres run 

 across the medullary parenchyma in a dorso-ventral dn^ection and 

 apparently belong to the cortical layer of circular fibres. In 

 text-fig. 213 some of these fibres are seen to cross the medullary 

 parenchyma and then to join the longitudinal series of cortical 

 fibres. Possibly these fibres assist in the rupture of the 

 proglottids to expel the eggs, and their presence may also account 

 for the particularly active movements of this species which have 

 been referred to above. 



Text-fig. 209. 



Amplobcenia dasyurl, transverse section tlirough part of body- wall. M, two delicate 

 layers of circular fibres between which is a special layer ot longitudinal fibres 

 grouped into bundles. T., testis. 



The excretory vessels are two on each side and are accurately 

 superposed, i. e. dorsal and ventral. Later on in the body only one 

 vessel is very plainly visible on each side, and this is of greater 

 calibre than anteriorly. 



The gonads and their ducts appear very early in the strobila of 

 Anoplotcenia clasyuri. They commence to be visible within less 

 than 1 mm. of the head immediately after the anterior set of very 

 short segments. The segments, when the ducts are first visible, 



