The Evolution of Man — Volume 1

by Ernst Haeckel

FIGURE 1.30. GASTRULA OF A GASTRAEAD.

FIGURE 1.31. GASTRULA OF A WORM.

FIGURE 1.32. GASTRULA OF AN ECHINODERM.

FIGURE 1.33. GASTRULA OF AN ARTHROPOD.

FIGURE 1.34. GASTRULA OF A MOLLUSC.

FIGURE 1.35. GASTRULA OF A VERTEBRATE.

FIGURE 1.36. GASTRULA OF A LOWER SPONGE.

FIGURE 1.37. CELLS FROM THE PRIMARY GERMINAL LAYERS.

FIGURE 1.38. GASTRULATION OF THE AMPHIOXUS.

FIGURE 1.39. GASTRULA OF THE AMPHIOXUS.