MAMMALIAN CESTODES. 



555 



were embryos, since in Diamare's figures they are clearly eggs 

 which have not yet segmented to form embryos. In Dipylidhmi 

 caninum (as I suppose), an example of which I have studied from 

 the Asiatic Jackal, the separate chambers of the mature uterus 

 were very plainly lined with a cellular layer. I may observe of 

 this Dipylidhmi incidentally that the number of embryos in a 

 given chamber was very much greater than what is figured in 

 that species by Diamare, who only represents 3-7. I found quite 

 30 or more. 



Text-fio-. 88. 



Dipylidium caninum. 



A portion of uterus in a mature proglottid. 



ejL). Epitlielial lining of uterine cavities. O. Embrj-os. 



In Dipylidmm dongolense there was not, so far as I could see, 

 any special lining membrane to the small chambers which lodged, 

 each of them, a developing embryo. It will be obseiwed in the 

 text-figure (text-fig. 87) which illustrates the mature " uterus " 

 of the present species, that the appearances presented are con- 

 sistent with the view that the chambers which contain the eggs 

 are merely interstices in the general medullary network. Their 

 walls are perfectly continuous with the medullary tissue lying to 

 the inside of the longitudinal muscles and foi-ming the peripheral 

 layer of the medulla. Though the walls of the cavities often 

 contain imbedded in them crowded nuclei, it must be borne in 

 mind that the peripheral layer of the medulla is also crowded 



