Undescribed bones located in pectoral region of Muraenidae are reported. Typically there are either one or two small horn-shaped bones located posterior to intersection of supracleithrum and cleithrum. A deep concavity is present at posterior end of each bone. In species with a single bone, posterior section of bone is attached to a triangular sheet of cartilage. In species with two bones, one is dorsal to the other, and no posterior sheet of cartilage is associated with either. Of the two subfamilies of Muraenidae, the bones are lacking in all but one species of Uropterygiinae and vary in presence and number in Muraeninae. Monopenchelys acuta lacks these bones but has a posterior sheet of cartilage. Gymnothorax melatremus has three bone elements. Comparisons with pectoral bones of other anguilliform taxa suggests that bones in muraenids represent the scapula and coracoid.