This Apple document says the driver is available for auto-download and install when you add the printer in Print & Scan:
OS X: Printer and scanner software available for download
OS X has a new paradigm for getting print drivers.
Manufacturers give the current driver(s) to Apple to put on its servers.
OS X keeps an "index" of where to find drivers (whether on the server or already installed on your Mac), and when you Add the printer in Print & Scan prefs, or on demand in the print dialog, OS X finds and uses the driver.
No need to download and install anything yourself.
If your Mac says it can't find the driver, you can force CUPS (OS X's print system) to re-build the index of drivers (both online and already installed drivers) by Resetting Printing System:
OS X Mavericks: Reset the printing system
If you're still not getting it working, you can download and install all the epson drivers from:
Epson Printer Drivers v2.18 for OS X
(you may still need to Reset Printing in order to have the drivers found.)