What is a species of shark (Lamna cornubica), about eight feet long, having a pointed nose and a crescent-shaped tail; -- called also mackerel shark. [Written also probeagle.] called?

porbeagle — A species of shark (Lamna cornubica), about eight feet long, having a pointed nose and a crescent-shaped tail; -- called also mackerel shark. [Written also probeagle.]. (Webster's 1913.)