NEW CESTODES FROM THE TASMANIAN DEVIL. 



691 



are not at all visible in sagittal sections ; they appear as a 

 continuous mass. 



The sjKrm-cluGt I'uns straight for a short way after it has left 

 the cirrus sac. It forms a copious coil (text-fig. 100) occupying the 

 middle of the body and lying partly dorsally to the receptacuhmi 

 seminis and rather nearei- to the pore side of each proglottid. The 

 rest of the coil — that part which is nearest to the cirrus sac — is 



Text-fig-. 101. 



Sagittal section showing in consecutive segments the varying relations of 

 cirrus sac (the larger tube) and vagina. 



to the poi-e side of the receptaculum, and therefore ventral in 

 position. In fact, regarded as one coil, this region appears oblique 

 in direction in transverse sections of the progiottids. Between the 

 individual loops of the sperm-duct are cells which quite fill up 

 the interstices, and are thus numerous in proportion to the width 



