Plate 86. 



Fig. a. Hill-rimraed basin abovo the jjor.^e of Yimiuri River, Matanzas, Cuba. 



B. Upper end of Yumuri gorge looking toward tlie basin. 



C. View upstream from the lower end of Yumuri gorge. If this basin were 



depressed between 50 and 100 feet a poucli-shaped harlior witli a 

 narrow entrance would result. 



275 



