The upper parts were pink cinnamon, with a rufous hue in the middle of the back.

It was also found on sand dunes where sea oats (Uniola paniculata), a high growing grass species, is the dominant vegetation.

Like the nominate subspecies, the Chadwick Beach cotton mouse was nocturnal.

It is now presumed extinct after extensive surveys in 1984, 1985, 1988, and 1989 failed to find the mouse again.

Causes for its disappearance might have been the deforestation of the maritime forests in the southernmost part of Sarasota County, as well as predation by feral cats.