132 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



Plate 30. 



Plastron of Neuranhylus wyomingensis, No. 7581, U.S.N.M. Type. Ventral \-iew. 

 About one-third natural size. 



Plate 31. 



Carapace of Bacna antiqua Lambe, No. 8801, U.S.N.M. Superior view. About two- 

 thirds natui'al size. 



Plate 32. 



Plastron of Ba'ena antiqua Lambe, No. 8801, U.S.N.M. Ventral \'iew. About two- 

 thirds natural size. 



Plate 33. 



Carapace of Boremys albertensis, No. 8803, U.S.N.M. Type. Superior view. About 

 one-half natural size. 



Plate 34. 



Plastron of Boremys albertensis, No. 8803, U.S.N.M. Type. Ventral view. About 

 one-half natural size. 



Plate 35. 



Shell of Agomphus alahamensis, No. 8806, U.S.N.M. Tj'pe. Viewed from the left 

 side. More than one-half natural size. 



Plate 36. 



Fig. 1. Carapace of Echmatemys megaulax (Cope), No. 7316, U.S.N.M. Superior view. 

 2. Plastron of same. Ventral view. Both figures slightly less than natiu-al 

 size. 



Plate 37. 



Carapace of Aspideretes latus, No. 8802, U.S.N.M. Type. Superior view. More 

 than one-half natural size. 



