These are the pharyngeal gills or arches of a human early in development. http://php.med.unsw.edu.au/embryology/index.php?title=Pharyngeal_a...
Shark egg sac - "Mermaid's purse"
Human Carnegie stage 10-23.jpg
– Haeckel Embryology – Color plate 04 | Vintage
Human egg emerging from the ovary
A human zygote in the 8 cell stage.
A 6 week old human embryo.
These odd-looking creatures are, in fact, two-day-old zebrafish larvae, as seen through a scanning electron microscope.
Medical - Embryology