NEW CESTODES FROM THE TASMANIAN DEVIL. 



691 



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

 continuous mass. 



The S'jierm-cluct runs 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 receptaculum 

 seminis and rather nearer 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 pore side of the receptaculum, and therefore ventral in 

 position. In fact, regarded as one coil, this region appeal's oblique 

 in dii'ection in transverse sections of the proglottids. 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 



