Proceedings Am. Philos. Soc. Vol. LII. No. 209 



Plate III 



A. ]<"lut(_'d and i)ittod hills at kilometer 183, near Quixada, Ccara. War- 

 ing, phot., i(ji2. 



B. Fluted and pitted hills at kilometer 183^2, near Quixada, Ceara. 

 Waring, phot., igi2. 



