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  1. Nota intorno ad un caso di dicefalia nell'Anguis fragilis (Linn.) / par Michele Lessona.
    By: Lessona, Michele, - Accademia delle scienze di Torino.
    Publication info: [Torino] :Stamperia reale di Torino :1877.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    Subjects: Anguis fragilis  Dicephalism  
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  2. An unusually large (53 mm.) two-headed brook trout, Salmo fontinalis. American Museum novitates ; no. 369
    By: Gudger, E. W. (Eugene Willis), 1866-1956.
    Publication info: New York City : American Museum of Natural History 1929
    Contributed by: American Museum of Natural History Library
    Subjects: Abnormalities  Brook trout  Dicephalism  Fishes  Hatchery fishes  Head  New York (State)  Salmonidae  
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