How to get the MESH filenames from the urdf_parser?

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Hi, I am trying to retrieve the mesh file names/paths from the robot URDF description. I seem to be able to get all of the other information (link name, mesh origin, parent/child link names, etc.).

Here is my code:

urdf::Model urdfModel;
if (!urdfModel.initParam("robot_description")) {
        ROS_ERROR("Error parsing URDF file...");
        return false;
}
string lnk_name = "/r2/left_palm";
boost::shared_ptr<urdf::Link> lnk;
urdfModel.getLink(lnk_name, lnk);

cout << "what is the type of model: " << viz->geometry->type << endl;
cout << viz->origin.position.x << endl;
cout << viz->origin.position.y << endl;
cout << viz->origin.position.z << endl;

That all works great, but I can't for the life of me figure out where the meshname is stored....

Thanks!