Page 1250, line 7 from top, for "Dictyoprora" read "Dictyoprona."

Page 1251, line 11 from top, add "Pl. [62], fig. 3."

Page 1356, line 9 from foot, add "Pl. [68], fig. 14."

Page 1384, line 2 from foot, for "Calocycloma" read "Calocyclura."

Page 1411, first line, add "Pl. [68], fig. 15."

Page 1560, line 2 from top, add "Dictyocha trigona, Zittel, 1876 (L. N. [29], p. 83, Taf. ii. fig. 6), is an interesting Cretaceous species, perhaps a variety of Dictyocha triommata."

Page 1615, line 6 from top, insert "n. sp." after "scenophora."

Page 1653, line 7 from top, add "John Murray, 1876, L. N. [27], pl. 24, fig. 2."

Page 1706, line 7 from foot, add "John Murray, 1876, L. N. [27], pl. 24, fig. 4."

Page 1752, line 4 from bottom, for "figs. 1a-1d" read "figs. 1a-1c."