The Division of Invertebrates currently holds approximately 14,700 cataloged lots (= specimen series) of non-mollusk invertebrates. The best-represented groups among these are the Arthropoda (ca. 50%), Annelida (20 %), Echinodermata (8 %), Cnidaria (7%) and Porifera (5 %). The core of the holdings are collections acquired by The Field Museum from the 1893 Columbian Exposition. Additions to these collections have come via collecting efforts with primary focus on other groups and the deposit of voucher material. In recent years, deep sea invertebrates collected by submersible became a focus of our non-mollusk holdings (see databases of hydrothermal vent and wood fall invertebrates).