http://www.peteducation.com/article.cfm?c=17+1797&aid=2700 "Shells: Anatomy and Diseases of Turtle and Tortoise Shells" more than 50 fused bones parts of the shell Tortoise carapaces http://www.peteducation.com/article.cfm?c=17+1797&aid=2700 الأصل "Shells: Anatomy and Diseases of Turtle and Tortoise Shells"