CORRIGENDA

Page 139, three lines from bottom, for "S^r" read "S^R."

Page 152, 13 lines from bottom, for " Df-S" read "Dp-S."

Page 160, last line, and page 161, first line, should read "as a duplication for the S locus and a deficiency for the ast locus—that is, its composition may be written S⁺S⁺."

Page 161, line 3, for " ast⁺ ast⁺" read "S⁺ S⁺."

Page 163, nine lines from bottom, for "(+ast )⁴(S+)" read "(+ast) (S+)."

Page 165, five lines from top, for "lz^r and lz ^gl" read "lz^s and lz^g."