NEBRASKA: _Adams_: 1 mi. N Ayr (Hudson, 1942:101). _Dawson_: 2 mi. SE Gothenburg (Gehlbach and Collette, 1959:142). _Franklin_: 2 mi. SW Naponee. _Gage_: 1 mi. W Barnston. _Hitchcock_: 3 mi. E Stratton. _Holt_: Elkhorn River "near" Atkinson. _Lancaster_: Lincoln (Hudson, _loc. cit._). _Lincoln_: 1 mi. S Sutherland (Gehlbach and Collette, _loc. cit._). _Red Willow_: 14 mi. NW McCook. _Richardson_: 2 mi. S Rulo. _Wheeler_: 2 mi. W Ericson (Hudson, _loc. cit._). OKLAHOMA: _LeFlore_: Wister (Conant and Goin, 1948:9); Shady Pointe (KKA); Poteau River, 6.5 mi. W Heavener (Trowbridge, 1937:301). _Tulsa_: Arkansas River "near" Tulsa (Force, 1930:38). WYOMING: _Goshen_: Platte River (Conant and Goin, 1948:10). =Trionyx spinifer asper= (Agassiz) Gulf Coast Spiny Softshell Plates 37 and 38 _Aspidonectes asper_ Agassiz, Contr. Nat. Hist. United States, 1(Pt. 2):405; 2(Pt. 3):pl. 6, fig. 3, 1857. _Trionyx spinifer asper_ Schwartz, Charleston Mus. Leaflet, No. 26:17, pls. 1-3, map 2, May, 1956. _Platypeltis agassizii_ Baur, Amer. Nat., 22:1121, 1888. _Type._--Lectotype, MCZ 1597; alcoholic female; locality designated as Pearl River, Columbus, Marion County, Mississippi; received from Mr. Winthrop Sargent of Natchez, Mississippi. _Range._--Southeastern United States except peninsular Florida from the Florida Parishes of Louisiana east to southern North Carolina; Gulf Coast drainage including that of Lake Pontchartrain, Louisiana, eastward to the Apalachicola River system, and Atlantic Coast drainage including that of the Altamaha River in Georgia northward to the Pee Dee River drainage in South Carolina (see map, Fig 19). _Diagnosis._--Juvenal pattern of black ocelli and spots, and two or more black, interrupted, lines paralleling rear margin of carapace; pale postocular and postlabial stripes often united on side of head; length of plastron short. _Description._--Plastral length of smallest hatchling, 2.9 centimeters (USNM 134244); of largest male, 13.2 centimeters (TU 17117); of largest female, 27.0 centimeters (TU 13474).