Alcithoe arabicula Marwick, 1926 † (original description)
Alcithoe brevis Marwick, 1926 † (original description)
Alcithoe cylindrica Marwick, 1926 † (original description)
Alcithoe dilatata Marwick, 1926 † (original description)
Alcithoe exigua Marwick, 1926 † (original description)
Alcithoe familiaris Marwick, 1926 † (original description)
Alcithoe finlayi Marwick, 1926 † (original description)
Alcithoe gatesi Marwick, 1926 † (original description)
Alcithoe haweraensis Marwick, 1926 † (original description)
Alcithoe hurupiensis Marwick, 1926 † (original description)
Alcithoe irregularis Marwick, 1926 † (original description)
Alcithoe larochei Marwick, 1926 (original description)
Alcithoe larochei larochei Marwick, 1926 (original description)
Alcithoe lepida Marwick, 1926 † (original description)
Alcithoe parva Marwick, 1926 † (original description)
Alcithoe scopi Marwick, 1926 † (original description)
Alcithoe solida Marwick, 1926 † (original description)
Alcithoe whakinoensis Marwick, 1926 † (original description)
Metamelon Marwick, 1926 † (original description)
Metamelon marshalli Marwick, 1926 † (original description)
Metamelon minima Marwick, 1926 † (original description)
Spinomelon Marwick, 1926 (original description)
Spinomelon enysi Marwick, 1926 † (original description)
Spinomelon mira Marwick, 1926 † (original description)
Spinomelon speighti Marwick, 1926 † (original description)