1920] Turtles of North Carolina 69 



19. Limbs thick and club-shaped, hind limbs the smallest. Shell 

 with concentric striae on the plates, but not keeled. Terrestrial and 

 burrowing in habits. Gopher Turtle {Gopherus pohjphemus) , South 

 Carolina. 



19. Limbs not club-shaped, hind limbs usually the largest. See 20. 



20. Masticating surface of jaws narrow. See 21. 



20. Masticating surface of jaws broad. See 23. 



21. Shell with concentric striae on the plates, giving each plate a 

 lumpy appearance. Shell keeled. Terrestrial. Wood Terrapin 

 (Clemmys insculptus), New Jersey. 



21. Shell smooth without striae or keel. Shell four inches or 

 less. See 22. 



22. Head and carapace with small round yellow spots. (9) 

 Spotted Terrapin {Clemmys guttatus). 



22. Carapace and head without round yellow spots, a yellow 

 patch on each side of neck. 



(10) Mountain Terrapin {Clemmys nuchaUs), 



Muhlenberg's Terrapin {Clemmys muhlenheyg), N. J. 



23. Masticating surface of jaws with longitudinal ridge down 

 middle. See 24. 



23. Masticating surface of jaws without longitudinal ridge ; shell 

 keeled. See 34. 



24. Head and neck when extended about two-thirds length of 

 shell, shell high and narrow, with a reticulated pattern of narrow 

 yoUow lines in large mesh. (11) Chicken Turtle {Deirochelys .eticu- 

 laria) . H 



24. Head and neck not more than half length of shell. See 25. 



25. Size comparatively small, usually not more than five inches 

 in length of shell, shell smooth, no variegated markings on large 

 plates of carapace. Shell with red markings around the edge. See 26. 



25. Size comparatively large, adults from five inches to a foot 

 or more in length of shell. Large plates of carapace usually with 

 variegated markings. Plates of shell usually with longitudinal 

 wrinkles. See 27. 



26. Costal plates in line with the vertebrals so that the plates are 

 in straight rows across the shell. (12) Painted Turtle {Chrysemys 

 picta). 



