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Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains of chlorophyll.

Cross-section of a leaf

Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains…

<i>Amphidotus cordatus</i> or <i>Echinocardium cordatum</i>, commonly called a sea urchin, viewed from above. a, anterior ambulacrum, forming with b, b, anterolateral ambulacra, the trivium; c, c, two posterolateral ambulacra, forming the bivium; d, madreporic tubercle surrounded by genital pores; e, intrapetalous semita or fasciole; f, circumanal semita." &mdash;Whitney, 1889

Sea Urchin - View from Above

Amphidotus cordatus or Echinocardium cordatum, commonly called a sea urchin, viewed from above. a, anterior…