The lower incisors are partially inclined forwards, compressed and tapering, bevelled at the ends.
The bore is then reduced to 5Z-in., and a bevelled shoulder being made in the rock, a 5$-in.
These screws are turned from the eye-end by bevelled wheels and pinions, the latter connected with the handles a', b'.
Buchanan introduced an improved form on the " Challenger," also remaining closed by weight, the cylinder being very heavy and ground to fit the bevelled base-plate very accurately.
In certain species of mylodon the front pair of teeth in each jaw is placed some distance in front of the rest and has the crown surface obliquely bevelled by From Owen.