prim-JlEy neueomeres and head segmentation 355 



cannot be accepted. The median divisions observed in the 

 neural plate of Amblystoma are largely if not entirely due to 

 segmentation of the mesoderm, and so can be regarded onlj^ as 

 features of secondary importance. The primary neuromeres of 

 Locy and Hill, as well as those of Griggs and other students of 

 neuromerism, are irregular in size, inconstant in number, asym- 

 metrical in position, and cannot serve as trustworthy criteria 

 of the metamerism of the vertebrate head. 



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