ELASMOBRANCH BRAIN ORGANIZATION 



125 



Table 2. Elasmobranch brain :body data 



plane. Sections were stained by Bodian silver impregnations, cresyl violet, or 

 Kliiver-Barrera methods. Brain sections illustrated in Figures 2 through 7 are 

 from late fetal stages of Squalus (9.5-cm snout-vent length), Mustelus 

 (13.5-cm snout-vent length), and Platyrhinoidis (neonate). Individuals at this 

 stage of development possess all cell groups recognizable in the adults, but 

 the cell groups and their boundaries are not obscured by subsequent 24-fold 

 brain enlargement. 



