148 



ILLINOIS BIOLOGIC JEL MONOGRAPHS 



436] 



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

 host and that in B. histiophonis 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. nianu- 

 hriformis, D. laciniatiim and B. histiophonis are given for the sake of com- 

 parison; all dimensions are given in millimeters: 



Maximum length of strobila 



Maximum breadth of strobila 



Breadth at posterior end 



Length of scolex 



Breadth of terminal disc 



Breadth of scolex at middle 



Breadth at posterior end 



Breadth at constriction 



Depth of terminal disc 



Depth of scolex, middle 



Depth at posterior end 



Depth at constriction 



Length of first segment 



Breadth of same anteriorly 



Breadth of same posteriorly 



Length of m^edian segments 



Breadth of median segments 



Length of posterior segments 



Breadth of same 



Length of cirrus-sac 



Max. diameter of same 



Length of vaginal sphincter 



Diameter of same 



Dimensions of eggs 



Dimensions of calcareous bodies 



Number of testes 



Diameter of ova in ovarian isthmus 



D. laciniatum 



154 

 4 

 2 

 2 



O.S 

 0.4 

 0.6 

 0.25 

 0.5 

 0.55 

 0.35 

 0.25 

 0.7 

 0.3 

 0.65 

 0.3 

 0.3 

 1 



1.5 

 0.4 

 0.14 

 0.05 

 0.07 

 52x35m 

 17-24x8-14m 



B. histiophonis 



1.8 



0.^ 



0.3 



0.16 ("ripe") 

 0.5 ("ripe") 



45x35m 



50-70 

 0.15 



B. manubriformis 



220 



5 



2 



1.5-3.5 

 0.8-1.2 



0.64 



0.81 

 0.21-0.44 



0.89 

 0.90-1.05 



0.63 



0.58 



0.39 

 0.28-0.54 

 0.50-0.89 



1.0 

 2.50 

 0.50 

 0.14 

 0.05 

 0.07 

 58x34m 

 18-26x11-15m 

 60-70 

 0.15 



