88 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



are reduced to narrow slits. In this region the greater pari 

 of the scolex consists of a line fibrous connective tissue 

 containing few muscle fibres running mostly at right- 

 angles to each other from opposite sides of the scolex, which 

 is nearly square in cross section at this plane. Between 

 every two bothria there is a band of stout muscle-fibres ; 

 these are the fibres represented in surface view in fig. 5 ; 

 they originate mostly at the junction of scolex and neck, 

 but many are continuous with the longitudinal fibres in the 

 latter part of the strobila. The canals shown in section 

 near the bothria are part of the excretory channels. In 

 the neck these mostly run axially, but at the base of the 

 scolex they pass towards the bothria and run in the tissues 

 of the latter organs. 



Fig. 7, page 89, represents a transverse section of the 

 scolex anterior to the plane of the section just described. 

 It passes through the proboscis just anterior to the base of 

 the latter. The internal wall is thick and fibrous, and next 

 to this is a rather strong layer of muscle fibres running 

 circularly. External to this are the radial fibres arranged 

 just as in the ventral sucker of a Trematode. The external 

 wall of the proboscis is also thickened and fibrous, and 

 inserted into it, at nearly equal intervals, are strong muscle 

 bundles. These are the retractors of the proboscis, and are 

 the same structures as are represented in figs. 5 and (J. 

 A few excretory canals are to be seen in the section. With 

 the exception of the outer wall of the scolex which is 

 rather thick, the remaining tissue is a loose connective 

 stroma. 



Anterior to the plane of this section the anterior lips 

 of the proboscidial sucker are free from the internal walls 

 of the atrium into which the os leads. 



11. Myzorhynchus large and rosette-like and witlmul 

 a terminal os. Bothridia typical. 



