Variations in sea-pens and their peduncles. Source: Page 4 of https://www.mpi.govt.nz/dmsdocument/4376-aebr-132-pennatulaces-sea-pens-descriptions-for-the-new-zealand-region
sea pen structure
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)