CHUBB, L.J. - Thyrastylon, a new rudist genus from the Upper Cretaceous of Guatemala, The Antilles, and persia, with a discussion of the functions of rudist oscules and pillars.

1956. Palaeontographica Americana IV-27; pp. 31-48, 2 plts. h.t. Orig. extract, stapled, very good, uncut, 4to.

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