174 



GARDINER. 



EXPLANATION OF PLATE X. 



Two-celled stage. First cleavage. 



Four-celled stage viewed from above. 



Four-celled stage after the rotation of B and B' . 



Four-celled stage viewed from the side. 



Six-celled stage viewed from above. 



Si.\-celled stage viewed from the side. 



Eight-celled stage viewed from the side. 



Ten-celled stage viewed from the side. 



Ten-celled stage viewed from below. Natural color. Drawn by R. 



Ten-celled stage viewed from the side ; the ovum somewhat crescent- 



Ten-celled stage viewed from above. 



Twelve-celled stage viewed from the side as it goes into its resting 



Sixteen-celled stage viewed from above. 



Sixteen-celled stage viewed from below. 



Sixteen-celled stage viewed from the side ; becoming crescent-shaped. 



Eighteen-celled stage viewed from below. 



Eighteen-celled stage viewed from below as if transparent. 



Twenty-six-celled stage viewed from below. 



Twenty-six-celled stage viewed from below as if transparent. 



Thirty-eight-celled stage viewed from the side. 



