Representatives of the family Megalodontidae are widely distributed on the Southern and Northern Islands of Novaya Zemlya, as evidenced by the collections of B. A. Alferov (1934). A. Alferov (1934), A. A. Petrenko (1936), and B. V. Miloradovich (1936). V. Miloradovich (1936), processed by us for the present article.

The collection of Devonian and Etrenian platy-fossil mollusks that served as material for the present work (collections of R. A. Arakelyan, Institute of Geological Sciences, Academy of Sciences of the Armenian SSR), unfortunately, does not exhaust the richness and diversity of the fauna of Devonian pele- cypods of Armenia. The poor preservation of the overwhelming majority of forms has complicated the study of their internal structure and, in some cases, the generic diagnosis...