Plate, plate XIII showing small portal canal and ducts from liver of seal by unknown artist Plate XIII containing figures 1-3 (published as figures 15-16; figure 2 was not published in the paper) showing a small portal canal and small ducts from the liver of a seal. Subject: Zoology / Anatomy Published in Philosophical Transactions as 'On the ultimate arrangement of the biliary ducts, and on some other points in the anatomy of the liver of vertebrate animals'. Received by the Royal Society on 14 June 1855. Read 21 June 1855. February 1855