Stockwell (1878:401) wrote that _spinifer_ was found "as high as Athabasca." Presumably Stockwell referred to Lake Athabaska in northern Alberta and Saskatchewan, Canada, a region where soft-shelled turtles are unknown; see also the comments by Stejneger (1944:52). _Specimens examined._--Total 250 as follows: ALABAMA: _Morgan_: UMMZ 99578, "near" Decatur. ILLINOIS: _Adams_: INHS 2150, Quincy. _Bond_: INHS 8345, Greenville. _Carroll_: CNHM 42116, Ordnance School Proving Ground. _Cass_: INHS 2151, Beardstown. _Champaign_: INHS 2273, 2311, 2413, 3142, "near" Seymour; INHS 4229, Champaign; INHS 6163, Sidney. _Christian_: INHS 1560, Pana. _Coles_: INHS 1968-69, 2 mi. W Charleston. _Cumberland_: INHS 2282, Greenup. _De Witt_: INHS 7674, Farmer City. _Effingham_: UI 1322, 2281, 19365, "near" Effingham. _Fulton_: INHS 5531, 2 mi. NE Bluff City, Schyler County; UI 23449, Liverpool; UI 24611, Spoon River, 18 mi. NW Canton. _Hancock_: USNM 53522, 59277, "near" Hamilton. _Iroquois_: INHS 6869-70, 2.5 mi. N Crescent City. _Jackson_: TU 1369 (12), Elkville. _Kane_: CNHM 42400, Aurora. _Kankakee_: CNHM 324, Momence. _Kendall_: UI 2411, Plano. _Logan_: INHS 7171-72, 6 mi. N Lincoln. _Madison_: USNM 60571. _Macoupin_: UI 2401-02, Beaver Dam Lake. _Mason_: CNHM 346, 470, INHS 1122, 1559, 5756-58, UI 42, 2404, Havana, Lake Chautauqua. _Mercer_: CNHM 3220, New Boston. _Morgan_: CNHM 2067 (2), 3290, 3303-04, 3306, INHS 2152, 2154, 5132-37, USNM 54747, Meredosia. _Moultrie_: INHS 8989, 2 mi. NW Lovington. _Peoria_: UI 2406-10, Peoria. _Pope_: INHS 5505, Lake Glendale. _Putnam_: UMMZ 81604-14, 5 mi. N Henry, Marshall County. _Schuyler_: UI 2405, "near" Ripley, Brown County. _Scott_: INHS 2149, 2153, Naples. _Union_: CNHM 18623, 6 mi. SW Jonesboro. _Vermilion_: INHS 3142, Muncie; INHS (1 untagged); UI 1970, 3209, Danville; UI 2403, 1.5 mi. E Oakwood; UI 16265, Kickapoo State Park. _Wabash_: USNM 12061, Mt. Carmel. _Winnebago_: INHS 7185, Kishwaukee Forest Preserve; INHS 7294, 1/2 mi. S Shirland. _County unknown_: USNM 7661. INDIANA: _Bartholomew_: UMMZ 61060, 10 mi. W Columbus. _Carroll_: USNM 42905-06, Burlington. _Clark_: UMMZ 110599, 14-mile Creek, 3 mi. NW Charleston. _Decatur_: UMMZ 55416, 3 mi. S Westport. _Elkhart_: UMMZ 105598, Elkhart River, south of Goshen. _Gibson_: UMMZ 89744, Foot's Pond. _Johnson_: UMMZ 108062, 2 mi. S Trafalgar. _Knox_: USNM 22711, Vincennes. _Kosciusko_: AMNH 8379, UMMZ 84287 (5), Winona Lake; UMMZ 110235, Wawasee Lake. _Lake_: CNHM 11019, 11021-24, Crown Point. _Marion_: UMMZ 103393, Ravenswood; UMMZ 110236, 1 mi. N Lawrence. _Marshall_: CNHM 39299; USNM 33495, Yellow River north of Burr Oak; USNM 33496-501, 35404, 42583-84, Lake Maxinkuckee. _Wells_: UMMZ 63523, Wabash River, Bluffton. _County unknown_ (Lagrange or Marshall): USNM 50670, Twin Lakes.