(Sarah of the Clue Crew indicates a pair of bones on the monitor.)  There are many types of bone fractures; here, the oblique fracture is closed with a diagonal break, while this type, an open fracture, breaks through the skin
The natural history of the sperm whale : its anatomy ... [PAR] Happiness of the Crew on board the "Sarah and Elizabeth"  proper conduct of 
the ...... and upon which those in the lower jaw strike when the mouth is closed.