Plate 4. 
Figs. 1,2. 
Gopherus praecedens. Type. Left xiphiplastral bone. Two-thirds 
natural size. No. 5463. P. 55. 
1. 
Seen from below. 
2. 
Seen from above. 
Fig. 3- 
Terrapene formosa. Type. Hinder two-thirds of the carapace. One- 
half natural size. No. 2973. P. 57. 
Figs. 4,5. 
Terrapene antipex. Two-thirds natural size. P. 58. 
4 - 
Hinder lobe of plastron. Allen specimen. 
5 - 
Right side of front of carapace. No. 4435. 
Fig. 6. 
Trachemys euglyphat Part of nuchal bone. Two-thirds natural 
size. No. 5775. P. 70. 
7 - 
Chelydra sculpta? Part of supposed right fourth costal plate. Two- 
thirds natural size. No. 7091. P. 73 
