Distribution: Cape Cod to east and west coasts of Florida, Texas; Bermuda; Brazil. Size: 3 mm
Description: Color dark chocolate brown, protoconch brownish, base darkest brown; shell narrowly fusiform, barrel shaped; first postnuclear whorls with 2 glassy beaded cords, latter teleoconch whorls with 3 beaded whorls; beaded cords attached by spiral and axial threads, producing inner spaces between intersections; protoconch smooth; aperture oval; short siphonal canal; operculum corneous.
Habitat: In bays, inlets, and shelly sand at depths from 0 to 75 m (246 ft). Remarks: Often confused with C. gemmulosa and C. fusiformis. However, C. greenii is smaller and darker and has a higher spire than C. gemmulosa; and C. fusiformis has a broader spire, is lighter brown than C. greenii, and is darker than C. gemmulosa. See Ode (1989c); Barrera (2001).