Browsing named entities in Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition. You can also browse the collection for Aurelia (North Dakota, United States) or search for Aurelia (North Dakota, United States) in all documents.

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Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition, Chapter 16: 1850-1852: Aet. 43-45. (search)
sting between polyps, medusae, and echinoderms, and to designate by the same name organs seemingly so different. Especially has the minute examination of the thickness of the test in echinoderms revealed to me unexpected relations between the sea-urchin and the medusa. No one suspects, I fancy, at this moment, that the solid envelope of the Scutellae and the Clypeasters is traversed by a net-work of radiating tubes, corresponding to those of the medusae, so well presented by Ehrenberg in Aurelia aurita. If the Berlin zoologists will take the trouble to file off the surface of the test of an Echinarachnius parma, they will find a circular canal as large and as continuous as that of the medusae. The aquiferous tubes specified above open into this canal. But the same thing may be found under various modifications in other genera of the family. Since I have succeeded in injecting colored liquid into the beroids, for instance, and keeping them alive with it circulating in their tran