AVIAN CESTODES. 875 



description of the eggs of Oochoristica loageneri, which is nearest 

 to, if not identical witli, my species, except to state that they are 

 provided with a shelh The sharply defined edge of the shell 

 differentiates the ovmn or the cells of the embryo, if it has deA^e- 

 loped so far, which lie within it from a layer of cells which forms 

 a follicle, and is so far like that which has just been described in 

 EugonodcGum. There are, however, diflferences to be noted which 

 will be apparent from the two figures (text-figs. 148, 149) which 

 illustrate the two species, and which are drawn practically to the 

 same scale. The cells of the ears'-follicle in Oochoristica have 



Text-fiii-. 149. 



\ 



m w 



A section through a portion of the medullarjf parenchyma of Oochoristica, showing 

 five eggs or developing embryos, j). One pole of the usually elliptical 

 embryo-sac. 



nuclei of a different appearance and form a thicker layer in that 

 the nuclei are more abundant and closer together. Furthermore, 

 this cellular layer is just as well developed in the largest as 

 in the smallest follicle. The cells do not disappear dviring the 

 growth of the contained embryo, as would appear to be the case 

 with Eugonodceuni. It is easy to believe, therefore, in accordance 

 with the opinion of the authors quoted above, that the egg-sacs 

 in Oochoristica are portions of a subdivided uterus. I have, 

 however, myself no facts to offer in confirmation of this view. 



