Note
Bioerosion by the urchin Echinometra lucunter (Linnaeus) has been studied previously in Barbados (McLean, 1967), Bermuda (Hunt, 1969), and the Virgin Islands (Ogden, 1977). Another species, E. mathaei, has been studied in Persian Gulf reefs by Shinn (p. 39, in Hughes Clarke and Keij, 1973) and Enewetak (Russo, 1980). The purposes of this study are to determine the rate of sediment production and cavity formation by E. lucunter using a new method, to characterize the size distribution of the particles produced, and to compare these data with the rate of production and size of particles produced by the rock-boring infauna closely associated with the urchin bore holes.