OHIO: _Brown_: mouth White Oak Creek, Higginsport. _Muskingum_: "near" Gaysport. _Pike_: Scioto River in Camp Creek, Newton and Scioto Twps.; Pike Lake. _Scioto_: Scioto River in Clay and Rush Twps.; Scioto River, Portsmouth; Scioto River, 3 mi. N Rushtown. _Tuscarawas_: Tuscarawas River, 2 mi. below Gnadenhutten; "near" Winfield. _Washington_: Dam No. 2, Muskingum River, northern edge of Marietta; Ohio River, 4 mi. SE Marietta (Conant, 1951:156, 264). OKLAHOMA: _Alfalfa_: 6.5 mi. NE Ingersoll. _Comanche_: Camp Boulder, Wichita National Forest (Ortenburger and Freeman, 1930:188). _McCurtain_: _Pushmataha_: (Ortenburger, 1927:100). PENNSYLVANIA: _Allegheny_: Neville Island, Ohio River below Pittsburgh (Atkinson, 1901:154). _Clarion_: Allegheny River at Foxburg (Netting, 1944:85). ?SOUTH DAKOTA: _County unknown_: Fort Mackenzie, Missouri River, 6-8 mi. below Cedar Island (Stejneger, 1944:15). TENNESSEE: _Lake_: Mississippi River (Parker, 1948:29). _Pickett_: Obey River at Eagle Creek Ford (Shoup, Peyton and Gentry, 1941:75). WISCONSIN: _Crawford_: _Pepin_: Mississippi River (Breckenridge, 1944:183; Pope and Dickinson, 1928:82). =Trionyx muticus calvatus= Webb Gulf Coast Smooth Softshell Plate 47 _Trionyx muticus calvatus_ Webb, Univ. Kansas Publ. Mus. Nat. Hist., 11:519, 1 fig., 2 pls., August 14, 1959. _Type._--Holotype, UI 31071, hatchling, sex undetermined, alcoholic; obtained from Pearl River, Roses Bluff, 14 miles northeast Jackson, Rankin County, Mississippi, by William F. Childers on August 25, 1952. _Range._--Southeastern United States from the Florida Parishes of Louisiana eastward to the western end of the panhandle of Florida; rivers of the Gulf Coast drainage from the Escambia River drainage, Florida, westward to Louisiana and Mississippi including the Pearl River drainage. The eastern extent of geographic range is not known (see map, Fig. 22). _Diagnosis._--Juvenal pattern of large circular spots, often ocellate; no stripes on dorsal surface of snout; pattern on dorsal surface of limbs of fine markings, not in contrast with ground color; pale postocular stripes having thick black borders approximately one half width of pale stripe on adult males. _Description._--Plastral length of smallest hatchling, 3.0 centimeters (TU 17301); of largest male, 11.8 centimeters (KU 47118); of largest female, 18.0 centimeters (TU 13473). Juvenal pattern of dusky, circular spots, some ocellate, lacking short lines and streaks; number of spots variable; some spots on carapace of hatchlings may have maximum diameter of three millimeters (TU 17301); pale rim of carapace having dusky, ragged, inner border; juvenal pattern on adult males absent or usually evident, at least posteriorly (TU 17306.1).