Figure 10.

Lepisosteus osseus. A) Stage 2, live specimen treated with pronase to dissolve the egg envelopes. B) Stage 4, live specimen. C) Stage 5, live specimen. D) Stage 10, electron micrograph. E) Stage 30, live specimen. arrow = cleavage furrow extending beyond the blastoderm margin dl = dorsal lip ysl = yolk syncytial layer