ERRATA AND ADDENDA. 
Page 7, Bibliography 4, for ‘1738’ read ‘1737-1738.’ 
Page 17, line 8, for ‘hypoblast behind’ vead ‘hypoblast behind the blasto- 
ore.’ 
‘ Page 18, line 2 from bottom and footnote, for ‘ Faivre’ read ‘ Fabre.’ 
Page 30, line 12 from bottom, for ‘ Hypoboscidze’ read ‘ Hippoboscidee.’ 
Page 33, last line, for ‘xvi.’ vead ‘xiv.’ 
Page 35, paragraph 3. Newport’s Segment.—The further discussion of 
Newport’s segment has been omitted ; the questions involved have, however, 
been discussed in relation to the genital segments. I regard Newport’s 
segment as of post-embryonic origin, and, like the cephalic post-oral somites, 
as unrepresented in the embryo. On the post-embryonic somites, consult 
ZO: 
Page 38, line 6, ‘(see Sensory organs)’-—the portion of the work referred 
to will be found on p. 71. 
Page 65, in footnote, for ‘K. L. C’ read *C. L. C 
Page 77, in footnote, for ‘Chironomus’ vead ‘ Corethra.’ 
Page 210, line 1, ‘seventh segment of the male,’ see note to p. 744. 
Page 262, Bibliography, ‘127’ is printed a second time in error before 
‘Viallanes,’ and should be omitted. 
Page 292, Bibliography, ‘See also Zool. Anzeig., Bd. viii.,’ etc., should be 
included in 145, and 146 should be: ‘146. KOWALEVSKI, A., “Zum Ver- 
halten des Riickengefiisses, und des guirlandenférmigen Zellenstranges der 
Musciden wihrend der Metamorphose.” Biol. Centralblatt, Bd. vi., p. 74, 
1886. 
Page 332, line 14 from bottom, for ‘ Pl. VIII? vead ‘ Pl. XVIII? 
Page 466. The pyramidal ganglia are perhaps the representatives of the 
ganglia of the habenule ; the connections with the ocelli and the posterior 
commissure and crura are very suggestive of this view. 
Page 478, for ‘Y ung’ read ‘Yung, 
