A creeping Amœba, or unicellular Protist that changes its form continually; with cell-nucleus in the middle, within which is the nucleolus. After Haeckel.
A creeping Amœba, or unicellular Protist that changes its form continually; with cell-nucleus in the middle, within which is the nucleolus. After Haeckel.
Gastrula of a Gasteropoda (Gastrœada)After Haeckel.A. Ectoderm. B. Endoderm. C. Mouth. D. Gastric cavity.
Gastrula of a Gasteropoda (Gastrœada)After Haeckel.A. Ectoderm. B. Endoderm. C. Mouth. D. Gastric cavity.