(Caption to Figure 32) 



3 — The shape of the ovum from the side; embryo covers half of 

 the yolk sphere. 4 — The same; embryo covers three-quarters 

 of the yolk sphere. 6 — The embryo with wide spinal fissure, 

 the shape from above. 7 and 8 — The embryo with well-defined 

 ascending spinal shafts, shape from the side and from above. 

 9 and 10 — The embryo with closed back in the beginning of 

 the formation of vertebrae, lateral and upper view. 13 — Pear- 

 shaped embryo with closed spine at the beginning of vertebrae 

 formation, lateral and upper views. 14 and 15 — Twisted embryo, 

 lateral and upper view. 16 — The beginning of straightening 

 of the embryo, 18 — The embryo before hatching. 20 — Second 

 day after hatching. 23-27 — The anterior part of the digestive 

 tract, the first to fourth day after hatching. 



439 



