Light (A, B) and scanning electron (C-I) micrographs of Lesquereusia modesta. (A-C) View of many specimens to illustrate variability in shape and size of the shell. (D) Broad lateral view. (E) Narrow lateral view. (F) Close up view of aperture showing its circular outline and bordering small particles of quartz. (G) Detail of shell surface showing shape and arrangement of sand grains of quartz. (H, I) Close up view of a network of organic cement and porous structure of meshes.