Licania incana.

Botanical name: 

Licania incana Aubl. Rosaceae.

Guiana. The fruit is the size of a large olive and is dotted with red; the pulp is white; melting, and of a sweetish taste; the shell, or nut, is bony.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.