A TYPE OF EMBRYONIC DEVELOPMENT IN INSECTS 23 



appears in the fused area. Amnion and serosa adhere to each other along 

 the edges of the fissure; a shrinkage of the envelopes and a folding back 

 of the amnion cause them to gather on the dorsal side of the embr3^o 

 where the serosa sinks into the yolk in tubular form (the secondary 

 dorsal organ) and the amnion fornxs a provisional dorsal closure (Fig. 25, 

 do). Finally the ectoderm grows over the dorsal organ which becomes 

 detached and is wholly absorbed in the yolk. With the dorsal growth 

 of the ectodermal wall that replaces the amnion in its progress the 

 definitive dorsal closure is effected. Meanwhile the mid-gut has also 

 closed, and thus the embryonic development is completed. 



References 



To avoid unnecessary repetition the works noted below are for the most part 

 omitted from the hst of references following the chapters in Part I. Either they are 

 comprehensive treatises or they deal in more or less detail with the developmental 

 stages of a single insect from egg deposition to hatching. 



Balfour (1880), Berlese (1909), Blunck (1914), Brachet (1921), Brauer (1925), 

 Bruce (1887), Brues (1903), Butt (1934o, 1936), Carriere und Burger (1897), Cholod- 

 kovsky (1891d), Claypole (1898), Comstock (1924), Dawydoff (1922), Eastham (1927, 

 1930a), Emeis (1915), Evans (1902), Gambrell (1933), Ganin (1869), Gatenby (1917), 

 Graber (1879, 18896, 1890b), Hagan (1917), Hammerschmidt (1910), Hardenburg 

 (1929), Heider (1889), Heider (1913), Henneguy (1904), Heymons (1895a, 1896a, 

 18976, 18996, 1901), Hirschler (1907c, 19096, 1912, 1924), Huxley and DeBeer 

 (1934), Imms (1934), Johannsen (1929), Kahle (1908), Kellicott (1913), Kennel (1884- 

 1886), Kessel (1939), Knower (1900), Korotneff (1886), Korschelt (1912), Korschelt 

 and Heider (1899, 1936), Kowalewsky (1871), Lecaillon (18986), Leuzinger, Wiesmann 

 und Lehmann (1926), Lignau (19116), McBride (1914), Meisenheimer (1917), Mel- 

 lanby (1936), Melnikow (1869), Metschnikoff (1886a,6), Miall and Denny (1886), 

 Miail and Hammond (1900), Morgan (1927, 1934), Needham (1931), Nelson (1915), 

 Noack (1901), Noskiewicz und Poluszynski (1927), Nusbaum (1886), Packard 

 (18716, 1903), Paterson (1932, 1936), Patten (1884), Philiptschenko (1912), Richards 

 (1931), Roonwal (1936, 1937), Saito (1937), Sedgwick (1885-1888), Shinji (1919), 

 Snodgrass (1925, 1927, 19356), Spemann (1938), Strindberg (19136, 1914a), Tanquary 

 (1913), Tiegs and Murray (1938), Tillyard (1917), Toyama (1902), Uichanco (1924), 

 Uzel (1898), Voeltzkow (1889a), Waddington (1935), Weber (1933, 1937), Weismann 

 (1863), Weiss (1939), Wheeler (18896, 1893a), Wigglesworth (1939), Will (1888a), 

 Willey (1898), Witlaczil (1884), Woodworth (1889), Wray (1937), Zograff (1883). 



Krause (1939), Roonwal (1939), Snodgrass (1938). 



