Sentence:  Other unlucky accidents oft-times happen in these seas, as, when (especially in becalmings) men swim in the bearing ocean, the greedy <WSD>Hayen</WSD>, called Tuberon or Shark, armed with a double row of venomous teeth<!--sic!-->, pursue them, directed by a little rhombus or musculus, variously streaked and coloured with blue and white, that scuds to and fro to bring the shark intelligence. 
Meaning of the word marked with <WSD> tags:  A shark (scaleless cartilaginous fish).