30. Adelocyrtis spinosa.

ERRATA.

Page 23, line 3 from top, add "Compare also Myxobrachia cienkowski, Wagner, 1872, L. N. [23]."

Page 40, bottom line, add "The two following species are incompletely known:—Sphærozoum orientale, Dana, 1863, Ann. and Mag. Nat. Hist., vol. xii. p. 54. Sphærozoum sanderi, Dœnitz, 1871, L. N. [60], p. 71."

Page 65, line 15 from top, add "Cenosphæra radiata, Zittel, 1876 (L. N. [29], p. 84, Taf. ii. figs. 7, 8), a fossil Cretaceous species, is closely allied to Cenosphæra compacta."

Page 84, line 17 from top, add "Caryosphæra polysphærica, Bütschli, 1882 (L. N. [41], Taf. xxiii. fig. 12) is probably a Cromyosphæra (fossil in Barbados)."

Page 95, line 11 from top, add "Dermatosphæra, Ehrenberg, is a Collosphæra with small pores (compare L. N. [16], p. 533)."

Page 97, line 8 from foot, for "xxiv." read "xxxiv."

Page 122, line 14 from foot, for "Spongolonche" read "Spongolonchis."

Page 149, lines 1, 4, 6 and 12 from top, for "Spongolonche" read "Spongolonchis."