If the camera does have USB, then connect it to the mac, and switch it to play mode (usually how it works)...It should come up as a drive.
Open it, you may have to dig through some folders to find the movie files. If it is anything like JVC then they will probably use an odd extension for the files as well. (Ex: JVC is mpeg-2 encoded, but uses .mod as the file extension)
Just search google for your camera model, and 'file extension', should be able to find something.
Get MPEGStreamclip (free, so if it doesn't help no harm done). This program will allow you to transcode from mpeg to .dv .avi .mov .mp4 h.264, and on and on and on.
Then you can watch them on your mac, or in .dv you can edit in iMovie, etc.
Hope this is helpful,
Brian