Dermochelys coriacea
Date 1907
Source The reptile book; a comprehensive, popularised work on the structure and habits of the turtles, tortoises, crocodilians, lizards and snakes which inhabit the United States and northern Mexico (1907) http://www.archive.org/details/reptilebookcom00ditm
Author Raymond Lee Ditmars, 1876-1942
Source: https://commons.wikimedia.org/wiki/File:Dermochelys_coriacea.jpg

The leatherback sea turtle (Dermochelys coriacea), sometimes called the lute turtle or leathery turtle, is the largest of all living turtles. It can easily be differentiated from other modern sea turtles by its lack of a bony shell, hence the name. Instead, its carapace is covered by skin and oily flesh.