Fisurella or Fissurella: How To spell?
The word Fisurella is misspelled against Fissurella, a noun meaning "A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet."
Fissurella has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fi & urella which should not be misspelled with single 'S'
Wrong Spelling:  fi-s-urella  Correct Spelling:  fi-ss-urella 
Check more misspelled words of Fissurella to spell it correct.