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These extend downwards from the lower border of the coronary cushion to the inferior margin of the os pedis.

This is a tumour-like growth of horn, varying in size from the thickness of an ordinary quill pen to that of one's middle finger, growing down from the coronary cushion, and attached to the inner side of the wall of the hoof.

They here affect the wall just where the bevel in it for the accommodation of the coronary cushion has rendered it weakest.

Necrosis and consequent sloughing of the skin is bound to follow, and an extensive ulcerous wound, or a spreading suppuration of the coronary cushion is the result.

To do this a double sage-knife is run flatwise between the coronary cushion and the cartilage, with the convex surface of the blade towards the skin.