AVIAN CESTODES. 871 



its favour. In the first place thei'e is no trace that I can discover 

 of a pre-existent uterus*, whose subsequent fragmentation might 

 pi'oduce the result described above. Furthermore, the actual 

 cavities of the egg-holding apparatus are a later development, or 

 at any rate they increase in extent as the eggs within them grow. 

 Indeed it may, I think, be safely asserted that in the youngest 



Text-fig. 147. 



i. 





Part of the section illustrated in text-fig. 146 more highly magnified and showing 

 younger egg-sacs in parenchyma (e.s.) and testes (t.), which are very much 

 larger. 



groups of egg and surrounding cells there is no free space at all. 

 Nevertheless it might be said that all this was due to precocious 

 development, that in fact the rapid protrusion of ripe eggs from 

 the ovary had outstripped the growth of the uterus, which in 

 consequence appeared subsequently in point of time, and that 



* O/"., however, p. 865 under description of ovarj'. 



