Edward B. Knobel, The turtles, snakes, frogs and other reptiles and amphibians of New England and the north… (1896)
“ Body enclosed in a shell Turtles. With walking feet; shell hard: Plain gray, brown or black Figs. 1 to 7 Marked with colored stripes or spots 8 to 14 Shell soft, leathery 15 to 16 With swimming feet, like paddles 17 Body covered with scales Four legs ”
