Note
Surveys by the Johnson-Sea-
Link submersibles have revealed the presence of large populations of black
Centrostephanus, superficially resembling Diadema antillarum Philippi, along the
shelf edge prominences off the east coast of Florida in depths of 48-80 meters.
Typical habitats are aggregations of dead coral rubble, with seasonal growths
of leafy red algae. Some aspects of the biology of these echinoids are described.