Balmain Bug, Ibacus peronii
Plate 199. Péron's Ibacus Crab, Ibacus peronii (now known as the Balmain Bug, Ibacus peronii), found in Port Phillip Bay
One enormous specimen, 9 inches long and 5 in. 3 lines wide at front of carapace, presented by D. Best, Esq., from Phillip Island, is more roughly granular than usual and has seven distinct, large, angular teeth behind sinus. Not very uncommon in Hobson's Bay and on the shores outside Port Phillip.