us ) ▁however , ▁easily ▁adapt ▁to ▁man - made ▁structures , ▁and ▁have ▁become ▁important ▁invas ive ▁species . ▁O thers ▁still ▁are ▁often ▁found ▁attached ▁to ▁other ▁shell s , ▁perhaps ▁the ▁most ▁common ▁belonging ▁to ▁the ▁genus ▁M alle us . ▁ ▁Us es ▁Arch ae ological ▁evidence ▁indicates ▁that ▁people ▁in ▁Ne ol ith ic ▁Europe ▁were ▁trad ing ▁the ▁shell s ▁of ▁S . ▁ga eder opus ▁to ▁make ▁b angles ▁and ▁other ▁orn aments ▁throughout ▁much ▁of ▁the ▁Ne ol ith ic ▁period . ▁The ▁main ▁use ▁period ▁appears ▁to ▁have ▁been ▁from ▁around ▁ 5 3 5 0 ▁to ▁ 4 2 0 0 ▁BC . ▁The ▁shell s ▁were ▁har v ested ▁from ▁the ▁A ege an ▁Sea , ▁but ▁were ▁transport ed ▁far ▁into ▁the ▁center ▁of ▁the ▁continent . ▁In ▁the ▁L B K ▁and ▁L eng y el ▁cult ures , ▁Sp ond yl us ▁shell s ▁from ▁the ▁A ege an ▁Sea ▁were ▁worked ▁into ▁bra ce lets ▁and ▁bel t ▁bu ck les . ▁Over ▁time ▁styles ▁changed ▁with ▁the ▁middle ▁ne ol ith ic ▁favour ing ▁generally ▁larger ▁bar rel - sh aped ▁be ads ▁and ▁the ▁late ▁ne ol ith ic ▁smaller ▁fl atter ▁and ▁disk ▁sh aped ▁be ads . ▁ ▁Sign ific ant ▁finds ▁of ▁j ew el ry ▁made ▁from ▁Sp ond yl us ▁shell s ▁were ▁made ▁at ▁the ▁V arna ▁N ec ropol is . ▁During ▁the ▁late ▁Ne ol ith ic ▁the