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ILLINOIS BIOLOGICAL MONOGRAPHS 



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EXPLANATION OF PLATE 

 Fig. 1. — Lateral view of model of chondrocranium of Amiurus 10 mm. long. 



alis alisphenoid bone 



£sa anterior semicircular canal 



csl lateral semicircular canal 



csp posterior semicircular canal 



ect pro ectethmoid process 



ep b epiphysial bar 



eth ethmoid plate 



eth cr ethmoid cornu 



f n foramen orbito-nasale 



hmd hyomandibular 



hmds VII hyomandibularis branch of VII 



hy hyoid arch 



inth interhyal 



tn Meckel's cartilage 



occ occipital arch 



olf olfactory foramen 



