Plate 16 



FAMILY TRIONYCHID^ 



SPINY SOFT-SHELLED TURTLE Trionyx spmif&r. 



Distribution: Ohio and Mississippi Valley. 

 Length of fully grown shell, 12 inches. 



SOUTHERN SOFT-SHELLED TURTLE Trionyx ferox. 



Distribution: Southwestern United States. 



Length of fully grown shell, 18 inches. 



