FIGURE 17. Centres of damage on fifty-two shells of Mellopegma georginense Runnegar and Jell, 1976 and Mellopegma schizocheras sp. nov. from the Gowers Formation. Damage inferred on internal moulds from imprints of scars and embayed regions of missing shell, usually with smooth margin of damaged area. Note the concentration of damage in the sub-apical region of the shell. Dashed line shows location of zygion in the related species Eurekapegma cooperi MacKinnon, 1985.