52 THE TAPE-WORM 



(e) The parenchjona, a packing tissue, scattered throughout which are 



numerous small calcareous bodies. 

 (/) The longitudinal excretory canals. 

 (g) The longitudinal lateral nerve cords. 

 (h) The uterus. 

 (i) The oviduct. 

 (j) The vagina. 

 (&) The ovary. 

 (1) The testes. 



A Ripe or Gravid Proglottis. 



Examine a ripe proglottis, one which has been stained and mounted ; 

 and notice that only traces of the reproductive organs remain, excepting 

 the uterus, which has become extensively branched and is full of developing 

 eggs or embryos. 



Open a proglottis, force out some of the eggs and examine these with a high 

 power. Notice that the rounded embryos within their tough double envelopes 

 have each six chitinous hooks (hexacanth embryo). 



