314 





* "V 





Fig. 147 

 Atypical (A-C) and typical (D) differentiation of portions of Triton early gas- 

 trulae, grafted (interplanted) into the orbit of larvae. A, Notochordal tissue from 

 presumptive epidermis. B, Notochordal tissue from presumptive endoderm. 

 C, Cartilage from presumptive neural plate. D, Epithelial vesicle from pre- 



