PLATE 60. 



ANTACEA. 



Fig. 1-4. G.tLEORHiNus L.^EVis (Page 17G). Fig. 5-9. Sqd.^lus ac.\nthi.\s (Page 192). 



1. Nearly natural length. M. C. Z. 1301. 

 2-3. Nearly natin-al 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 embryo. 

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

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

 depletion of the nutriment of the egg. Partially attached eggs, before entire disappearance, are con- 

 siderably modified on the side in contact with the wall to which after the egg is absorbed the embryo 

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

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

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



