Out of the box it is not possible to connect to your new Jolla via SSH over USB from OSX.
This is inconvenient: for instance I do lots of development work on the train, where there is no WLAN (or rather it there is, but not free), or at work, where I can't connect the Jolla to the corporate network, and have not got it (yet) to connect to the Visitor WLAN.
But with a bit of tweaking it is possible to get an SSH over USB connection going.