Nudibranchs. 20 and 21. Acanthodoris brunnea MacFarland -Dorsal view and
detail of dorsal papillae. 22. Polycera atra MacFarland - lateral view.
20 and 21 painted by Anna B. Nash of the Hopkins Seaside Laboratory. In:
"Opisthobranchiate Mollusca from Monterey Bay ....", Bulletin of the Bureau of
Fisheries, Volume 25, 1905. P. 151, Plate XXIX.
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