148 



ILLINOIS BIOLOGICAL MONOGRAPHS 



436] 



able that eggs pass out from the tapeworm into the alimentary canal of the 

 host and that in B. histiophorus the eggs pass freely out from each proglottis 

 and do not wait until the posterior proglottides break off to make their escape 

 from the parent." 



In the following table a number of important measurements of B. manu- 

 hriformis, D. laciniatum and B. histiophorus are given for the sake of com- 

 parison; all dimensions are given in millimeters: 



