▁h ips ▁from ▁an ▁early ▁age , ▁and ▁had ▁his ▁left ▁leg ▁am put ated , ▁using ▁an ▁artificial ▁leg ▁and ▁a ▁cr utch ▁there after . ▁ ▁He ▁entered ▁Can ter bury ▁College ▁in ▁ 1 8 7 5 ▁as ▁an ▁un mat ric ulated ▁student , ▁and ▁mat ric ulated ▁three ▁years ▁later . ▁In ▁ 1 8 8 1 , ▁he ▁gained ▁a ▁Master ▁of ▁Art ▁with ▁first ▁class ▁hon ours , ▁having ▁been ▁taught ▁by ▁Frederick ▁W oll ast on ▁H utton , ▁who ▁inspired ▁him ▁to ▁take ▁up ▁bi ology , ▁especially ▁the ▁study ▁of ▁cr ust ace ans , ▁which ▁had ▁been ▁little ▁studied ▁in ▁New ▁Zealand ▁up ▁to ▁that ▁time . ▁Ch il ton ' s ▁first ▁scientific ▁publication ▁followed ▁that ▁same ▁year , ▁when ▁he ▁described ▁three ▁new ▁species ▁of ▁cr ust ace an ▁( two ▁c rab s ▁and ▁one ▁is op od ) ▁from ▁Ly tt el ton ▁Har bour ▁and ▁Lake ▁P up u ke . ▁He ▁surprised ▁the ▁scientific ▁world ▁later ▁that ▁year ▁by ▁describing ▁four ▁species ▁of ▁am ph ip od ▁and ▁is op od ▁from ▁ground w aters ▁at ▁the ▁family ▁farm ▁in ▁E y re ton . ▁He ▁went ▁on ▁to ▁discover ▁the ▁is op od ▁Ph re ato icus ▁typ icus ▁in ▁the ▁same ▁location , ▁the ▁first ▁example ▁ever ▁described ▁of ▁the ▁sub order ▁Ph re ato ic idea , ▁the ▁" ear liest ▁derived ▁is op od [ s ] ". ▁ ▁Ch il ton