SOME MAMMALIAN TAPEWORMS. 



659 



uterus. The uterus has entirely vanished, and the paruterine 

 organs are imbedded in the tissues of the body. 



Text-fiL'. 159. 





\ 



Paruterine organs of Thysanosoma f/amhiamim move highlj' magnified. 

 S. Walls of paruterine sacs. O. P]mbryos. 



80 much for the condition in tlie fully ripe proglottides. Earlier 

 in the body this formation of paruterine sacs is preceded by a 

 uterus which is not very conspicuous, and consists of not much 

 more than a transversely running tube extending nearly right 

 across the proglottid in which the eggs occur, but with which the 

 uterus never appears to be stufted. I could find no outgrowths 

 of this centrally placed uterus, and there was certainly nothing 

 in the nature of a reticular formation of its cavity. Gradually 

 the cavity of the uterus appeared, as it were, to dry up and the 

 eggs were found — to continue the simile — stranded in the tissue of 

 the body. At this time the formation of the paruterine sacs 

 became visible. Round each egg, or round two or three, as the case 

 might be, the tissue of the medullary region of the proglottid 

 became denser, this being shown by its darker staining. There 

 was thus a concentration of tissue round the ova. This concen- 

 tration of tissue had no relations that I could detect with the 



