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 | | Though the radial symmetry of the sand dollar Echinarachnius parma is striking, we show that the mass and thickness of the anterior portion is greater than that of the posterior portion. |
 | | Cabanac, A., and Himmelman, J. Population structure of the sand dollar Echinarachnius parma in the subtidal zone of the northern Gulf of StLawrence, eastern Canada. |
 | | Tilney, L. G., and Gibbins, J. Microtubules and filaments in the filopodia of the secondary mesenchyme cells of Arbacia punctulata and Echinarachnius parma. |
| www.bio.umass.edu /biology/kunkel/fish/sand_dollar/sand-bib2000.html (4349 words) |
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