FIGURE 1.78. SECTION OF YOUNG SAGITTA.
FIGURES 1.79 AND 1.80. SECTION OF AMPHIOXUS-LARVAE.
FIGURES 1.81 AND 1.82. SECTION OF AMPHIOXUS-LARVAE.
FIGURES 1.83 AND 1.84. CHORDULA OF THE AMPHIOXUS.
FIGURES 1.85 AND 1.86. CHORDULA OF THE AMPHIBIA.
FIGURES 1.87 AND 1.88. SECTION OF COELOMULA-EMBRYOS OF VERTEBRATES.
FIGURES 1.89 AND 1.90. SECTION OF COELOMULA-EMBRYO OF TRITON.
FIGURE 1.91. DORSAL PART OF THREE TRITON-EMBRYOS.
FIGURE 1.92. CHORDULA-EMBRYO OF A BIRD.
FIGURE 1.93. VERTEBRATE-EMBRYO OF A BIRD.