ABBREVIATIONS FOR ALL FIGURES 
Arch., Archenteron 
Coel., Coelomic cavity 
Ect., Eectoderm 
Gut End., Gut entoderm 
Int., Intestine 
Lat. Mes., Lateral plate of mesoderm 
Mes., Mesentery 
Meson., Mesonephros 
Myo., Myotome 
Noto., Notochord 
P. Card., Post cardinal vein 
Periph. End., Peripheral entoderm 
Roof End., Roof entoderm 
S. C., Sex-cells 
S. Gl., Sex-gland 
Sub-Germ. Cav., Sub-germinal cavity 
Sub-Germ. End., Sub-germinal ento- 
derm 
Sw. Bl., Swim bladder 
Vit. End., Vitelline entoderm 
Wolff. D., \ : 
W. D., poles duel 
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