OEIGIN OF CYSTICA AND CESTOIDEA. 



71 



seven others were from four to six lines long, and showed a 

 commencing articulation. A few worms of six lines in length 

 appeared already distinctly jointed. Amongst the remaining 

 specimens that had become fully developed into T&niae, several 

 had attained the length of from sixteen to twenty-six inches. 

 (Fig. 35). In the longest individuals the development of the 



Fig. 35. 



eggs was completed, in several shorter ones the characteristic 

 scar on the last joint was wanting, and from the posterior edge 

 of the last transversely truncated joint one could plainly per- 

 ceive that these Taenice had already cast off matured joints (pro- 

 glottides), and indeed it so happened that the dog had passed 

 tape- worm joints with his fseces several days before his death. 

 Fourth experiment. On the same day with the last mentioned 



Fig. 35. A T&nia serrata, produced from a scolex of Ccenurus cerebralis in a dog's 

 intestine, in thirty-eight days ; natural size. The hindermost joints are fully formed 

 proglottides. At the posterior extremity of the last joint the scar (*) clearly indicates 

 that no proglottis has yet detached itself from this tape-worm. 



