I have the Broadfoot version of the muster roll, if that will help (I'll email it, request from kjones@tarleton.edu). I notice that there is a "Pharris, Isaac" as well as a "Farriss, J." (which could easily be a typo for "Farriss,
I"; same man?)

Broadfoot gives only names, states, branch, units/companies, and rank if other than private. If you need a service record, you can read the "how to" at the National Archives site.