Puffinus, the Latinised form of the English "Puffin"; from "to puff"=to blow in an intermittent way, thence "to swell," French "bouffer "; from the swollen bill of Fratercula artica, Brisson seems to have applied the name to the Shearwater, from Willoughby calling it the " Puffin of the Isle of Man."
Of moderate size. Bill slender, compressed, much hooked at tip. Tubular nostrils terminate in two distinct openings directed forward and upward. First primary longest. Tarsus compressed, reticulated. Hind claw distinct.