Green Sea Turtle (Chelonia mydas)
The long-lived green sea turtle weighs up to 850 pounds (382.5 kg), but anything more than 450 pounds (202.5 kg) is unusual today. The shell is heart-shaped, broad and flatter than most other sea turtles. It also lacks a central ridge.
The link address is: http://warnell.forestry.uga.edu/service/library/index.php3?docID=98&docHistory%5B%5D=5&docHistory%5B%5D=202&docHistory%5B%5D=363