We present 16 structures that were original described as P (1) over bar but
are properly described as monoclinic C2/c, and one revised from P (1) over
bar to triganal R (3) over bar as well as the other one from P (1) over ba
r to tetragonal I4(1)/a, The clues for correction of symmetry are analysed,
and the great importance of publishing the full atomic coordinates in a st
ructural report is emphasized.