Light (A, B) and scanning electron (C-I) micrographs of Archerella flavum. (A-C) View of many specimens to illustrate variability in shape and size of the shell. (D-F) Broad lateral view of three individuals to show the general shape and smooth shell surface. (G) Narrow lateral view. (H) Apertural view to show small aperture. (I) Close up view of aperture showing its oval outline and thin apertural collar.