Figs. 28-29. Transverse sections of the trunk of an embryo on the sixth day
after impregnation.
Fig. 28. Through anterior part of trunk (from a slightly older embryo than
the other sections of this stage).
Fig. 29. Slightly posterior to fig. 28, shewing formation of segmental duct
as a fold of the somatic mesoblast.
Fig. 30. Longitudinal horizontal section of embryo on the sixth day
after impregnation, passing through the mesoblastic somites, notochord,
and medullary canal.
Figs. 31-34. Transverse sections through an embryo on the seventh day
after impregnation.
Fig. 31. Through anterior part of trunk.
Fig. 32. Through the trunk somewhat behind fig. 31.
Fig. 33. Through tail region.
Fig. 34. Further back than fig. 33, shewing constriction of tail from the
yolk.
Figs. 35-37. Transverse sections through an embryo on the eighth day after
impregnation.
Fig. 35. Through fore-brain and optic vesicles.
Fig. 36. Through hind-brain, shewing closed auditory pits, &c.
Fig. 37. Through anterior part of trunk.
Fig. 38. Section through tail of an embryo on the ninth day after
impregnation.