What is a part of a turtle which is next to the upper shell. It contains a fatty and gelatinous substance of a dull greenish tinge, much esteemed as a delicacy in preparations of turtle called?

calipash — A part of a turtle which is next to the upper shell. It contains a fatty and gelatinous substance of a dull greenish tinge, much esteemed as a delicacy in preparations of turtle. (Webster's 1913.)