190 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
This slit is the opening of a deep and rather large 
cavity. Fig. 15 represents a transverse section of the 
sscolex made directly through the widest part of the 
opening of the bothrium. Within this is a large cavity, 
which in the unpreserved specimen is probably nearly 
hemispherical in shape. ‘The darkly dotted areas at the 
sides of the openings of the bothria probably represent 
bundles of muscular and fibrous tissue, serving for the 
contraction of these openings. The irregular spaces 
Dibothriwm crassiceps. Mag. 33 dias. 
Fic. 15. Trans. section of Fic. 16. Similar section 
scolex through opening posterior to that shewn 
of bothrium’* in Fig. 15. 
represented in the figure within the walls of the bothria 
are probably the sections of excretory channels. Fig. 16 
represents a section made through the scolex some distance 
behind the opening of the bothrium. Here also a number 
of fibres are seen running irregularly, probably obliquely, 
round in the walls of the bothrium. ‘These no doubt 
function as constrictors of the latter. The cavity extends 
throughout almost all the length of the scolex. | 
