68 Journal of the Mitchell Society [Scpteiiiher 



10. Plastron comparatively large, both hind and front parts 

 moveable, pectoral plate subtriangnlar. Mud Turtles proper. See 12, 



11. Head without yt^llow stripes: shell strongly keeled at all ages. 

 Keeled Musk Turtle {Kinosiemon carinatuiii), Georgia. 



11. Head with yellow stripes, at least when young, shell not 

 keeled in adult. (6) Musk Turtle {Kinosternon odoratnm). 



12. Carapace with three longitudinal yellow stripes : head with 

 yellow stripes. Baur's Mud Turtle {Kinosternon Ixiuri), Florida. 



12, Carapace without stripes. See 13. 



13. Head with yellow stripes. Louisiana ]\Iud Turtle (Kinoster- 

 non suhruhriun hippocrepis), Georgia. 



13, Neither carapace nor head with stripes. See 14, 



14, Plastron rather small, bridge very narrow, nasal shield deeply 

 notched behind, Florida Mud Turtle (Kinosternon steinclachneri), 

 Florida, 



14. Plastron and bridge of normal size, nasal shield not notched 

 behind. (7) Common Mud Turtle (Kinosternon snhrubruni [pensil- 

 vanieton] ). 



15. Plastron in two pieces, both movable on a transverse hinge, 

 and joined to the carapace by a cartilaginous suture. See 16. 



15. Plastron in one solid piece, joined to the carapace by a bony 

 bridge. See 19. 



16, Hind feet fully webbed ; shell rather long and narrow, cara- 

 pace with small yellow dots. Blanding's Turtle (Eniys hlandingi), 

 Ohio. 



16. Shell short and high, hind feet little or not at all webbed. 

 Terrestrial species. Box Turtles. See 17. 



17. Quadratojugal arch present. Shell usually with narrow ra- 

 diating lines on each plate. Hind feet somewhat webbed. Gulf Box 

 (Terrapene major), Georgia. 



17. Quadratojugal arch absent. Carapace with large yellow 

 spots, or broad radiating stripes, or unmarked. See 18. 



18. Claws on hind feet three each. Three-Toed Box Turtle 

 (Terrapene Carolina triumjuis) , Georgia. 



18. Claws on hind feet four each. (8) Common Box Turtle (Ter- 

 rapene Carolina). 



