PLATE 60. 



ANTACEA. 



Fig. 1-4. Galeorhinus laevis (Page 176). Fig. 5-9. Squalus acanthias (Page 192). 



1 . Nearly natural length . M . C . Z . 1 30 1 . 

 2-3. Nearly natural length. M. C. Z. 1304. 



4. Nearly natural length. M. c! Z. 1303. 



5. Two thirds natural length. 



6. Twice natural length. 

 7-9. Natural size. 

 5-9. M. C. Z. 1305. 



Figure 1 represents the egg in its membranous envelope before the appearance of the embt 

 Figures 2-4 show the embryo with the egg near the time the latter attaches itself to the wall of 

 oviduct, the attachment being a consequence of active development of the blood vessels and ra 

 dejik'tion of the nutriment of the egg. Partially attached eggs, before entire disappearance, are c 

 sidorably modified on the side in contact with the wall to which after the egg is absorbed the emb 

 remains attached by the cord. The egg of Squalus, fig. 5 and 7, is one that carries a sufficient ama 

 of nutriment for the development and growth of the embryo without attachment to the surround 

 walls. The distribution of the blood vessels over the yolk differs much from that in fig. 2-4. 



