Tu face page 3o ] 



II.— i. 



EPIDOTE GRANITITE GNEISS, x 12, 

 TIKURU, ESSEQUIBO RIVER. 



Fhutu hy J. Williams. 





DIORITE GNEISS, x 30, 

 TUPEKU, MAZARUNI RIVER. 



I'hulu Li/ J. Williams. 



