Cerithium nesioticum Pilsbry and Vanatta, 1905. (Synonyms: Cerithium pusillum Nuttall, Jay Cat., 1839; nomen nudum; C. lacteum Kiener, Martens and Langkavel, 1871; C. voyi Pilsbry and Vanatta, 1905.) Length, 15 mm; diameter, 7 mm. Shell: conic-obese; inflated; with finely beaded spiral threads; white. Spire: protoconch of three smooth, white whorls; teleoconch of six inflated whorls; suture barely impressed. Sculpture: fine, alternating larger and smaller beaded spiral threads, the larger threads often obsoletely granular. Aperture: subovate; outer lip simple; siphonal canal barely recurved. Color: white with occasional faint brown splashes. This is one of the most commonly occurring of the shallow-water Hawaiian cerithids, found in sand in tide pools and on fringing reefs.
C. nesioticum occurs throughout the Pacific Ocean and in the Indian Ocean (Tomlin, 1935a). The Hawaiian shells are distinguished from those occurring elsewhere by their more prominent granules and the brown splashes on the white background.

Cerithium spiculum: Shell narrow, subulate, with a sharply-pointed spire and a rounded base. Colour dull white, dis-tantly, faintly, irregularly, and minutely spotted with chestnut. Whorls eleven, slowly increasing, somewhat turreted, flattened. Sculpture: on the uppermost whorls the spiral ridges are tuberculated by longitudinal plications which rapidly diminish as the growth proceeds. On the last whorl their influence is barely perceptible in faint, shallow, longitudinal undulations. A stout varix occurs a third of a whorl behind the aperture ; from four to ten, raised, spiral cords encircle each whorl, in the interstices of which are line spiral threads. Aperture perpendicular, oval; outer lip straight and sharp; canal very short, turned abruptly outwards. Length 11, breadth 4 mm.