E E E A T A. 



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

 Page 40, bottom line, add "The two following species are incompletely known: — Sphmrozoum 



orientale, Dana, 1863, Ann. ami Mag. Nat. Hist., vol. xii. p. 54. Splwerozoum sanderi, Doenitz, 



1871, L. N. 60, p. 71." 

 Page 65, line 15 from top, add " Ccnosphcera radiata, Zittel, 1876 (L. N. 29, p. 84, Taf. ii. figs. 7, 8), 



a fossil Cretaceous species, is closely alUed to Cenosplhcera compacia." 

 Page 84, line 17 from io^, add " Caryosphwra po??/spA.a:?-tca, Biitschli, 1882 (L. N. 41, Taf xxiii. 



fig. 12) is probably a Cromyosphmra (fossil in Barbados)." 

 Page 95, line 11 from top, add " Bermatosphcera, Ehrenberg, is a C'ollosphcera with small pores 



(compare L. N. 16, p. 533)." 

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

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

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

 Page 149, line 2 from foot, /or "Spongolonche" read " Spiongoloiichis (oTroyyoy, Xoyx'?)." 

 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 ohlongum, Harting, 1863, L. N. 18, p. 15, 



pi. 2, fig. 42. 

 Page 326, line 14 fi-om foot, for " 1872 " read " 1875." 

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



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

 Pacfe 492, bottom line, add " Porodiscus haeckclii = Trematodiscus haeckelii, Biitschli, 1882, 



L. N. 41, Taf. xxiv. figs. 5a, 5b." 

 Page 509, bottom line, add " Stylodidya Imeckelii, Zittel, 1876, L. N. 29, p. 85, Taf. ii. fig. 9, is a 



fossil Cretaceous species, related to Stylodictya multispina." 

 Page 534, line 1 1 from foot, add " Indian Ocean, Cocos Islands (Eabbe). Also in the Central 



Pacific, Station 267." 

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

 Page 586, line 7 from foot, add " Spongotrochus ehreribergii, Biitschli, 1882, L N. 41, Taf. xxvi. 



figs, la, Ih." 

 Page 633, bottom line, add " Monozonium liartingii = Haliomma amphiaspis, Harting, 1863 



(L. N. 18, p. 15, pi. 2, fig. 43)." 



