A NEW SPECIES OF TAPEWORM. 397 



a very difficult one microscopically and morphologically to eluci- 

 date ; however, the difficulty has been overcome, and the following 

 is a concise description of the result. 



When the efferent canal of the vesicula seminalis dilates, and 

 the cuticle bifurcates so as to form the membrane of the male 

 genital organs on the one hand and the ductus of the funnel- 

 shaped male organ on the other, in the place of what would 

 under other or normal conditions have been the cirrus sheath 

 a truncated cone-shaped telescopic apparatus is formed in the 

 interior of the distal portion of the hollow of the funnel through 

 which the duct of the efferent canal of the vesicula seminalis 

 passes, and its orifice forms an emissary pore. This apparatus 

 is studded anteriorly with what are apparently minute spicules, 

 which, when the cone is everted, are seen to be situated on the 

 periphery of the emissary pore, and are deflected, giving it an 

 involute appearance. What part they play in the physiological 

 economy of the genital apparatus I am unable to say. 



Thus it will readily be seen and comprehended that a cirrus 

 with its accessories as a copulatory organ does not exist in this 

 species of tapeworm. 



When the vesicula seminalis is distended and filled to repletion 

 with sperm, a prolapsus ensues, caused by tension on the 

 surrounding parenchymatous tissue ; then the propelled semen 

 rushes forward along the ductus efferentia through the narrow 

 inner duct of the funnel, and the telescopic conical-shaped 

 apparatus mentioned above is forced out in the form of a 

 truncated cone, the sperm being emitted through the emissary 

 pore. In one segment the force of propulsion has been so great 

 as to rupture the cuticle and force out the male organ with the 

 sperm and parenchymatous tissue which lay mingled together 

 anteriorly protruding in the proximal isthmus which separates 

 one segment from the next. Throughout the whole length of 

 the strobila there were no hermaphroditic segments in actual 

 coition to be seen by the aid of a ^-in. objective, and but two 

 which had the male apparatus mentioned above everted. Of 



