CORRIGENDA. 



p. 200, 1. 4: for "vegetable" read "vegetative." 



p. 201, 1. 27: after "both" insert "somatoblasts." 



1.30: omit "CD." 



p. 209, 1. 9: before "pro totrochal" insert "the." 



p. 210, 1. 7: for "circle" read "row." 



p. 212, 1. 4: for "size-relation" read "size-relations." 



p. 217. 1. 7: for "ciliation" read "division." 



p. 236, 1. 14: for "are" read "is." 



p. 237, 1. 13: insert period after "forms." 



1. 34: for " disintegrated" read " disintegrate." 



p. 244, 1. 30: for " essentially" read " in many of its features." 



p. 247, 1. 12: omit "the importance of." 



1.13: omit "of." 



1. 14: for "has" read "have." 



p. 248, 1. 16: for " casual" read " causal." 



p. 253, 1.33: insert hyphen after " entoblast." 



p. 260, 1. 8: for " Ganzbeziehungsweise " read "Ganz- beziehungsweise. 



p. 267, 1. 1: for "Studien" read "Stadien." 



