South American shells in the AM collection. All figure pairs show the shell in apertural and dorsal views. A, B. Plekocheilus taylorianus, AM MA114951; H = 54.9 mm;. C, D. Plekocheilus tricolor, AM MA114865; H = 45.3 mm; E, F. Bostryx luridus, AM MA127334; H = 22.0 mm; G, H. Drymaeus cf. waldoschmidti, AM MA127336; H = 23.4 mm; I, J. Naesiotus sp., AM MA114717; H = 27.5 mm; K, L. Neopetraeus camachoi, paratype, AM MA73552; H = 33.6 mm; M, N. Cyclodontina inflata, AM MA112065; H = 27.3 mm. Scale bars: 5 mm (E–J, M, N); 2 cm (A, B); 1 cm (C, D, K, L).