The hairy chiton Mopalia kennerleyi Carpenter, 1864 is distinguished from its congener Mopalia ciliata (Sowerby, 1840), and the identity of Chiton wosnessenskii von Middendorff, 1847 is clarified. Mopalia kennerleyi and M. ciliata are distinguished by setae structure, valve sculpture, and radular teeth. Their characteristics are illustrated and discussed, and their distributions defined.