Summary: | FIG. 2. — Polymastia arctica (Merejkowsky, 1878); A, longitudinal section of the body and inhalant papilla; B, transversal section of the inhalant papilla; C, transversal section of the exhalant papilla. Abbreviations: b, bud; c, collagenous layer; e, exhalant canal; i, inhalant canal; p, palisade layer; s, subcortical layer of diffuse choanosomal spicules; t, tangential layer; v, vestibule. Scale bars: 1 mm. Published as part of Plotkin, Alexander & Boury-Esnault, Nicole, 2004, Alleged cosmopolitanism in sponges: the example of a common Arctic Polymastia (Porifera, Demospongiae, Hadromerida), pp. 13-20 in Zoosystema 26 (1) on page 17, DOI: 10.5281/zenodo.5393690
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