Middle Miocene bivalves of the Puerto Madryn Formation, Valdes Peninsule, Chubut Province, Argentina (Lucinidae - Pholadidae). Part 2. Palaeontographica Abteilung A Palaeozoologie-Stratigraphie, 231(4-6), Juni 1994: 93-132. 116 [Zoological Record Volume 131]