- Four stages in A B C D ° ```' the development of the trilobite Agnostus nudus.
- Right half of the anterior end of Sipunculus nudus, L., seen from the inner side and magnified.
- Sipunculus nudus, L., with introvert and head fully extended, laid open by an incision along the right side to show the internal organs, X 2.
- Four stages in A B C D Ã‚° ```' the development of the trilobite Agnostus nudus.
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