Pietro, originally from Milan in northern Italy, arrived at Ellis Island on October 18, 1909, at the age of 23.
==Bibliografija==V času svojega delovanja v Britanskem muzeju je napisal med drugim naslednja dela:* "Zoological Miscellany" (1814-1817)* "Monograph on the British Crabs, Lobsters, Prawns and other Crustacea with pendunculated eyes" (1815-1817)* "Systematic catalogue of the Specimens of the Indigenous Mammalia and Birds that are preserved at the British Museum" (1816)* "Synopsis of the Mollusca of Great Britain" (1820, uradno izdan šele 1852).