Journal of Comparative Neurology and Psychology. 



Fi^J 



Vol. XVII, Plate 



Anf. Pa/ fosr Pa/ 



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M/(/ /enfra/ Buds 



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. I. Shows the relative extent measured in sections of 7 

 s each of the various divisions of the anterior palatine, 

 posterior palatine, pharyngeal, proximal and distal hyoid and 

 mid-ventral buds on the longitudinal axis of the embryo. The 

 numbers indicate the sections bounding of the various sub-divi- 

 sions. Thf diagram is drawn to scale from series U. 



Figs. 2 and 3 are drawn to scale also, and show the extent of 

 attachment of the hyoid and gills to the copula and the extent 

 of the median ventral ridge on which buds are situated and the 

 segmentation of this ridge. Fig. 2 is plotted from series N, and 

 Fig. 5 from series U. A, the extent of attachment of the hyoid 

 and gills in each figure. B, the extent of the median ventral 

 ridge and its segmentation corresponding to the areas of attach- 

 ment of the gill. The numbers on the diagram represent the 

 limit 



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