72 



bulletin: museum of comparative zoology. 



somatic mesomer.; 

 splanchnic 



nph 'strri. 



Figures E-H. 



Four dia^^rammatic figures illustratinp: the similarity in origin of the fundament of a meso- 

 nephric blastula in Ichthyophis {E and F) and Amblystoma {G and //). The splanch- 

 noderm of both epimer and lateral mesoderm is shaded with liorizontal lines, that of the 

 mesomer (exclusive of the sclerotome, which is indicated b}' double horizontal lines) 

 with horizontal dashes. The somatoderm of both epimer and lateral mesoderm is 

 shaded with oblique lines, that of the mesomer with oblique dots and dashes. 



