Install xlsx package in R

Question

I am trying to install xlsx via CRAN for R.

install.packages("xslx")

# Warning message:
# package 'xlsx' is not available (for R version 3.1.2)

Does this mean that I need to get an older version of R?

OS X Yosemite 10.10 R 3.1.2 GUI 1.65 Mavericks build

Thank!