Professor Parker exhibited and described the following additions to the Museum, all collected in Sydney Harbour: (1.) The animal of Nautilus pompilius, mounted so as to show the interior of the mantle-cavity. (2.) Egg-shells of the Port Jackson shark (Heterodontus philippi). (3.) Dromia excavata in commensal association with a simple ascidian. (4.) The same, in commensal association with a compound ascidian. (5.) Octopus granulatus. (6.) Sepiola, sp.