Thalasic or Thalassic: How To spell?
The word Thalasic is misspelled against Thalassic, an adjective meaning "pertaining to the sea; -- sometimes applied to rocks fmed from sediments deposited upon the sea bottom."
Thalassic has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings thala & ic which should not be misspelled with single 'S'
Wrong Spelling:  thala-s-ic  Correct Spelling:  thala-ss-ic 
Find more wrongly spelled words of Thalassic to spell it well.