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ILLINOIS BIOLOGICAL MONOGRAPHS 



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EXPLANATION OF PLATE 



Fig. 3. — Model of chondrocranium of 32 mm. Amiurus, dorsal view. On the right side only 

 cartilage parts are shown, on the left the bones as weU, cartilage being stippled to con- 

 trast with the bones. 



Fig. 4. — Same, ventral view, cartilage only on left side, cartilage and bone on right of drawing. 



