FIGURES 2.222 TO 2.224. SECTIONS OF YOUNG AMPHIOXUS-LARVAE.
FIGURE 2.225. AN APPENDICARIA.

FIGURE 2.226. Chroococcus minor.

FIGURE 2.227. Aphanocapsa primordialis.

FIGURE 2.228. PROTAMOEBA.
FIGURE 2.229. ORIGINAL OVUM-CLEAVAGE.
FIGURE 2.230. MORULA.

FIGURES 2.231 AND 2.232. Magosphaera planula.

FIGURE 2.233. MODERN GASTRAEADS.

FIGURES 2.234 AND 2.235. Prophysema primordiale.