REPRODUCTION AND DEVELOPMENT 



IB lA 



131 



Endoderm 



Fig. 82. (a) segmentation of egg of Piscicola. (b) vertical section 



illustrating precocious gastrulation in Piscicola. From Dawydoff, 



1959, after Schmidt. 



Mese 



Germinal 

 band 



Mother cell 

 of germinal - 

 band 



Larval ectode 



Mother cell 

 f germinal 

 and 



oblast 



Fig. 83 . Dorsal view of embryo of Piscicola showing endodermal 



gut rudiment and formation of germinal bands after precocious 



gastrulation. From Grasse, 1959, after Schmidt, 



