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spec: A slug trades the shell for mobility , energy saving in not building a shell , and no need for calcium salts . In addition to his affiliation with the Academy , he is a Scientist Emeritus with the U.S. Geological Survey . Small relatives of the operculate genus Colobostylus can move 7 times their shell length each minute . He ran like one possessed , blindly , furiously , looking neither to the right nor left . We appreciate notification of any errors or inconsistencies in the data . Lower caps are set on credits for some individual measures . Thereafter , terms of all elected officers and Council ors shall begin on May 1 . 45:10 -17 et seq . Does it work ? Is your specimen in the correct proportion to be a juvenile ?