OEGANS OF KEPEODUCTION. 161 



in the sac, and probably for the attachment of the embryo. 



Fig. 72. — Abdomen of Aspredo batrachus, with the ova attached ; at a, the ova 

 are removed, to show the spongy structure of the skin, and the processes 

 filling the interspaces between the ova. (Natural size.) 



The inner walls of the sac are lined with long filaments, 



M 



