DescriptionImage from page 17 of "The Biological bulletin".jpg
English: Eisenia arborea
Figure 1. Tracings of the two Eisenia arborea blades. (A) the flow-protected morphology; (B) the flow-exposed morphology. The lines show the location of the midline of crests. In both blades, the proximal end of the blade is toward the bottom of the page, and flow is toward the top of the page.
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