478 



BERTRAM G. SMITH 



/' 3 



104 



106 



Figs. 103 to 105 Surface views of eggs of Cryptobranchus allegheniensis in 

 Stage 7, showing cleavage furrows. Figures 103 and 104 represent upper and 

 lower hemispheres, respectively, of the same egg. Camera drawings from pre- 

 served material. X 7. 



Fig. 106 Flquatorial view of an egg in Stage 8, showing cleavage pattern. 

 Camera drawing from preserved material. X 7. 



activity in cell division in an area excentrically situated, though 

 this is not so apparent in the particular egg under consideration 

 as in some other eggs in the same stage. In the lower hemisphere, 

 the biradial character of the cleavage pattern is preserved and 

 accentuated. 



In the egg represented in figure 105 we see the beginning of 

 a process of fundamental importance in the further history of 



