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, Doenitz, 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."

Page 149, line 2 from foot, for "Spongolonche" read "Spongolonchis (sp?????, ??????)."

Page 172, line 4 from foot, add Synonym "? Haliphormis hexacantha, Ehrenberg, 1872, L. N. 24, Taf. x. fig. 6."

Page 216, line 11 from foot, add "Taf. xiii."

Page 308, line 4 from top, add "Compare Haliomma oblongum, Harting, 1863, L. N. 18, p. 15, pl. 2, fig. 42."

Page 326, line 14 from foot, for "1872" read "1875."

Page 461, line 12 from foot, delete "H."

Page 463, line 10 from top, add "Indian Ocean, Cocos Islands, Rabbe."

Page 492, bottom line, add "Porodiscus haeckelii = Trematodiscus haeckelii, BÜtschli, 1882, L. N. 41, Taf. xxiv. figs. 5a, 5b."

Page 509, bottom line, add "Stylodictya haeckelii, Zittel, 1876, L. N. 29, p. 85, Taf. ii. fig. 9, is a fossil Cretaceous species, related to Stylodictya multispina."

Page 534, line 11 from foot, add "Indian Ocean, Cocos Islands (Rabbe). Also in the Central Pacific, Station 267."

Page 584, line 12 from top, for "1872" read "1875."

Page 586, line 7 from foot, add "Spongotrochus ehrenbergii, BÜtschli, 1882, L. N. 41, Taf. xxvi. figs. 1a, 1b."

Page 633, bottom line, add "Monozonium hartingii = Haliomma amphiaspis, Harting, 1863 (L. N. 18, p. 15, pl. 2, fig. 43)."

Page 763, line 8 from top, add "Pl. 132, fig. 11."

Page 784, line 16 from top, for "vi." read "xvi."

Page 802, line 14 from bottom, after "11a" insert "11c."

Page 839, line 13 from top, for "95" read "135."

Page 841, line 8 from foot, after "figs." insert "2."

Page 842, line 13 from top, add "Haliomma ligurinum, J. MÜller (= Haliommatidium ligurinum, Haeckel, L. N. 16, p. 423) seems to be closely allied to the preceding."

Page 889, line 6 from top, add "Cricoidea, BÜtschli, 1882 (L. N. 40, p. 537) = Nassellaria."

Page 951, line 9 from foot, add "Fossil in Barbados."

Page 952, line 2 from foot, add "Fossil in Barbados."

Page 966, line 10 from top, add "Fossil in Barbados."

Page 981, line 19 from top, add "Fossil in Barbados."

Page 1037, line 8 from top, add "Pl. 85, fig. 2."

Page 1081, line 12 from foot, add "Pl. 95, fig. 15."

Page 1158, line 10 from foot, for "516. Cyrtophormis" read "516. Cystophormis."

Page 1165, lines 8, 11 and 15 from foot, for "Cyrtophormis" read "Cystophormis."

Page 1165, bottom line, read "Cystophormis = bladder-basket; ??st?, f????."

Page 1166, lines 1, 7 and 13 from top, for "Cyrtophormis" read "Cystophormis."

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."

Page 1757, line 14 from bottom, for "fig. 1" read "figs. 1-13."

Page 1759, line 14 from bottom for "figs. 4a, 4b" read "figs. 4, 4a."