vol ved " ▁in ▁a ▁modern ▁sense . ▁Though ▁some ▁have ▁attributed ▁author ship ▁to ▁James on , ▁this ▁is ▁hot ly ▁cont ested ▁and ▁others ▁see ▁Grant ▁as ▁having ▁written ▁it , ▁as ▁the ▁first ▁significant ▁statement ▁to ▁relate ▁L amar ck ' s ▁concepts ▁to ▁the ▁ge ological ▁record ▁of ▁living ▁organ isms ▁of ▁the ▁past . ▁ ▁Dar win ▁made ▁a ▁discovery ▁new ▁to ▁science ▁when ▁he ▁observed ▁c ilia ▁moving ▁the ▁micro scop ic ▁lar va e ▁of ▁a ▁species ▁of ▁the ▁b ry oz o an ▁Fl ust ra . ▁He ▁r ushed ▁to ▁tell ▁Grant , ▁confirm ing ▁Grant ' s ▁belief ▁that ▁the ▁lar va e ▁of ▁these ▁marine ▁animals ▁were ▁free ▁sw imming , ▁but ▁was ▁ups et ▁when ▁Grant ▁claimed ▁rights ▁to ▁the ▁work . ▁Dar win ▁also ▁made ▁the ▁discovery ▁that ▁black ▁sp ores ▁often ▁found ▁in ▁o yst er ▁shell s ▁were ▁the ▁eggs ▁of ▁a ▁sk ate ▁le ech , ▁and ▁was ▁disappoint ed ▁when ▁Grant ▁announced ▁both ▁finds ▁to ▁the ▁Werner ian ▁on ▁ 2 4 ▁March ▁ 1 8 2 7 ▁without ▁giving ▁Dar win ▁credit , ▁though ▁Grant ▁in ▁his ▁publication ▁about ▁the ▁le ech ▁eggs ▁in ▁the ▁Edinburgh ▁Journal ▁of ▁Science ▁later ▁that ▁year ▁acknowled ged ▁" The ▁mer it ▁of ▁having ▁first ▁as cert ained ▁them ▁to ▁belong ▁to ▁that ▁animal ▁is ▁due ▁to ▁my ▁ze alous ▁young ▁friend ▁Mr ▁Charles ▁Dar win ▁of ▁Sh rew s bury ", ▁the ▁first ▁time ▁Dar win ' s