Okay, I have only found pics of the cunicularia and a drawing of the samoensis, of the two I would say it is the samoan sand dart because of the chin. the other brackish choices that I can't find pictures of are bryani, galatheansis, radiocularis, merensis, and tongaensis.
this is the samoensis
Oh dammit, Here is the pic I found before but I must have skipped the goggle on this one because I just found your pics. RATS. You can see why from this pic I thought it was not the one.