▁S late ▁of ▁Verm ont ▁in ▁the ▁late ▁ 1 9 th ▁century . ▁ ▁Description ▁ ▁Em m ons as pis ▁is ▁described ▁as ▁a ▁t ad pole ▁or ▁w orm - like ▁animal . ▁No ▁trace ▁of ▁a ▁sp inal ▁cord ▁is ▁present . ▁ ▁There ▁are ▁two ▁species : ▁Em mon as pis ▁worth an ella ▁and ▁Em mon as pis ▁camb ri ensis ▁( W al c ott ( ?) ▁ 1 8 8 6 ( ?) ▁ 1 9 1 1 ( ?) ). ▁ ▁E . ▁camb r ensis ▁has ▁been ▁described ▁as ▁a ▁gra pt ol ite , ▁a ▁ch ord ate , ▁an ▁ar th rop od ▁and ▁as ▁a ▁fr ond - like ▁organ ism . ▁ ▁Aff in ities ▁▁ ▁It ▁was ▁interpreted ▁by ▁pale ont ologist ▁C . ▁D . ▁Wal c ott ▁in ▁ 1 9 1 1 ▁as ▁a ▁pol ych a ete ▁w orm . ▁Although ▁some ▁pale ont olog ists ▁regard ▁it ▁as ▁an ▁early ▁ch ord ate ▁al lied ▁with ▁P ika ia ▁et ▁al ., ▁Con way ▁Morris ▁suggested ▁in ▁ 1 9 9 3 ▁that ▁it ▁might ▁be ▁a ▁Camb rian ▁desc endant ▁of ▁the ▁V end ian ▁form ▁P ter id in ium , ▁and ▁a ▁fr ond ose ▁morph ology ▁is ▁the ▁current ▁v og ue . ▁ ▁Notes ▁ ▁Category : Pre histor ic ▁inc ert ae ▁sed is ▁animal ▁gener a ▁Category : C amb rian ▁animals ▁of ▁North ▁America ▁Category