BULL. GEOL. SOC. AM. VOL. 9, 1897, PL. 3 
Figure 1.—Sanpsvone Dryer Eropep into Hummocks 
Freurr 2.—Rocky Porvar (10 THE LEFT) AND NORTHERN ENp or CHivena GronocicaL CANAL 
DIVIDE OF THE TEHUANTEPEC ISTHMUS 
