Diplococi or Diplococci: How To spell?
The word Diplococi is misspelled against Diplococci, which is plural of "Diplococcus"
Diplococci has double "cc" is mispronounced as "c"Remember double 'CC' in between the strings Diploco & i which should not be misspelled with single 'C'
Wrong Spelling:  Diploco-c-i  Correct Spelling:  Diploco-cc-i 
Find more incorrect spellings of Diplococci to spell right way.