Acheta, cricket, egg showing maturation division w.m. *

Acheta. first cleavage w.m. *

Acheta, superficial cleavage *

Acheta, superficial cleavage, nuclei migrating to surface *

Acheta, w.m. of egg showing formation of germ layer *

Acheta, w.m. of egg with young germ *

Acheta, w.m. of egg shows early blastokinesis, germ starts to roll in *

Acheta, w.m. of egg shows late blastokinesis, germ with limb buds *

Acheta, w.m. of egg showing rolling out of the germ *

Insect, t.s. of egg showing nuclei migrating to surface, cleavage

Insect, t.s. of egg showing superficial cleavage in the blastoderm

Insect, t.s. of egg showing young germ with primitive streak

Insect, t.s. of egg showing formation of amnion and serosa

Insect, t.s. of egg showing fusion of the embryonic envelopes

Insect, t.s. of older germ showing process of differentiation in ectoderm and mesoderm

Insect, t.s. of older germ in region of head

Carausius, walking stick, w.m. of germ with primordium of head, limb buds, neural groove, coelom *

Carausius, sagittal l.s. of egg with early germ

Carausius, sagittal l.s. of egg with medium germ

Carausius, sagittal l.s. of egg with later germ

Carausius, sagittal l.s. of egg with germ ready for hatching