When looking at the bevel gearbox shaft arrangement diagrams, the gearboxes are shown in plan view, but the actual rotational arrows are representative of the output shaft rotations viewed from the end of the shaft looking directly at it. A good visualisation of the gear arrangement can also be seen on the 3D CAD models for the Range-N bevel gearboxes configurable online. You can view the model with a transparent housing just to check gear orientation.