"13. S. inconstans. Size of last [S. cyclura, 1.10 by .40 (27.9 by 10.1 mm)] costae, thinner, not as wide as interspaces, 26; margin not as thick, .96, not as flanging; white, dark yellow-brown within. Common on west side of Bird Key on cacti. 584. Plate 3, figs. 7, 8." (Maynard & Clapp, 1920:119)