TO THE EMBRYOLOGY OF AMPHIBIA. 63 



point and carried to the right of the middle of the embryo. 

 Left ex-ovate in the former position. Embryo entirely re- 

 covered from its lateral curvature and quite normal. 



As in Group IV., Egg No. 4, the blastopore closed in this 



egg near the right point of puncture, the growing of its rim over 



the yolk being performed mostly by the ventral and left lateral 



lips. But unlike that egg (Fig. 79), the position of the embryo 



was more normal, although the main portion of it was formed 



on the upper hemisphere (Fig. 85'). 



Ygg No. 5. (Figs. 86 a-c, Fig. SC). 



April 17, 2:30 4- p.m.: — (Fig. a). Punctured at the approximate middle 

 point of the region opposite the first appearing dorsal lip, as 

 in Group IV., Egg No. 5, Fig. 71 a. The point of injury 

 was a little below the level of the dorsal lip, and the exuda- 

 tion of the contents somewhat serious so that the upper 

 hemisphere shrunk near the puncture. It soon recovered, 

 however. 



April 18, 2:40 p.m. : — (Fig. & = view from the original lower pole). 

 Area of the segmentation cavity disappeared. Blastopore 

 small, and about 30° dorsad from the ex-ovate. 



April 19, 3:10 p.m.: — (Fig. c). Blastopore closed, about 35° dorsad of 

 the ex-ovate, the increased distance (5°) being equal to about 

 half the diameter of the blastoporic circle in Fig. h. Em- 

 bryonic body distinct. 



Unlike the egg of the corresponding number in Group IV., 



the blastopore did not close in this egg at the punctured point, 



but 35° below it (Fig. 86'). We must suppose that the ventral 



lip was able to overcome the obstacle presented by the puncture 



and to grow further downward. The final closing point of the 



blastopore becomes as usual the tail end of the embryo which 



is not therefore formed entirely on the lower hemisphere as in 



Fig. 80. 



