Page 149, line 2 from foot, for "Spongolonche" read "Spongolonchis (σπόγγος, λογχίς)."
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."