684 



DR. F. E. BEDDARD ON 



depth of the invagin.ation of the anterior end of the scolex referred 

 to above. Tliis part of the scolex presents a very lax appearance 

 in sections, which is doubtless to be correlated with the irregular 

 outline of the scolex. Through this lax tissue stray in every 

 direction muscle-fibres which no doubt effect the retraction of this 

 anterior part of tlie scolex. The main mass of tissue in which the 

 muscular fibres run has the usual amorphous ground -substance of 

 the Cestoid body witli many nuclei ; but I have not made a 

 particular histological study of these tissues. 



Text-fig. 97. 



Piivt of transverse section tlirougli neck-region of Bast/urotmnia rohvsta. 



C. Cortical layer outside of longitudinal muscles {l.m.). 

 me. The thin niedullarj* la3er. 



Further back in the scolex the medullary region appears as 

 quite distinct from the cortical. In the hitter the muscular 

 fibres gi'adually collect into a massive bundle of longitudinally 

 running fibres which immediately surround the medulla and 

 occupy a great deal of the cortex. Within the scolex there is no 

 subdivision of this muscular mass into bundles such as I shall 



