Grampus griseus, (Cuvier) Gray. Grampus .
Length, 10 feet 6 inches. (After Flower).

Author Frederick W. True (Frederick William True) (1858–1914)
Subject: Killer Whale
Tag: Aquatic Mammals
Date 1883
Source/Photographer
English: True, Frederick W. (1885) Suggestions to the keepers of the U. S. Lifesaving stations, light-houses, and light-ships, and to other observers, relative to the best means of collecting and preserving specimens of whales and porpoises, Report of the Commissioner (United States Commission of Fish and Fisheries), 1883, Washington, DC: Government Printing Office
Source: https://commons.wikimedia.org/wiki/File:FMIB_34113_Grampus_griseus,_(Cuvier)_Gray_Grampus.jpeg

Risso's dolphin (Grampus griseus) is a species of dolphin in the family Delphinidae. It is commonly known as the Monk dolphin among Taiwanese fishermen. Risso's dolphins are found worldwide in temperate and tropical waters, usually in deep waters rather, but close to land.