▁may ▁appear ▁to ▁be ▁even ly ▁black - b rown , ▁slightly ▁l ighter ▁at ▁the ▁sides . ▁The ▁animal ▁is ▁very ▁sl ender , ▁gradually ▁narrow ing ▁posterior ly . ▁The ▁mant le ▁length ▁is ▁less ▁than ▁ 1 / 3 ▁of ▁the ▁body ▁length . ▁There ▁are ▁bl ur ry ▁black ▁bands ▁on ▁the ▁sides ▁of ▁the ▁mant le . ▁The ▁ke el ▁is ▁prominent , ▁light , ▁and ▁reaches ▁the ▁mant le . ▁The ▁head ▁and ▁neck ▁are ▁black ish . ▁The ▁sole ▁is ▁narrow ▁and ▁cre am ▁with ▁brown ▁or ▁orange ▁h ue . ▁The ▁body ▁m uc us ▁is ▁usually ▁colour less , ▁thick ▁and ▁stick y ▁but ▁it ▁is ▁yellow ish ▁when ▁the ▁sl ug ▁is ▁ir rit ated . ▁ ▁The ▁length ▁is ▁up ▁to ▁ 7 0   mm . ▁The ▁length ▁of ▁a ▁preserved ▁spec imen ▁is ▁ 3 0 – 4 0   mm . ▁ ▁Re product ive ▁system : ▁The ▁pen is ▁is ▁rounded , ▁wider ▁than ▁and ▁approximately ▁as ▁long ▁as ▁the ▁e pi ph all us . ▁The ▁vas ▁de fer ens ▁opening ▁is ▁clearly ▁asym met r ically ▁at ▁the ▁posterior ▁end ▁of ▁e pi ph all us . ▁Th erer ▁is ▁a ▁small ▁simple ▁pap illa ▁inside ▁the ▁pen is . ▁The ▁s per mat he ca ▁du ct ▁is ▁usually ▁thick ; ▁the ▁v ag ina ▁and ▁at rium ▁are ▁short , ▁the ▁v ag ina ▁access ory ▁g lands ▁are ▁two ▁lo be - like