XXXVIII.—On the internal structure of Terebratula pectunculoides, Schl., Terebratula pulchella, Nils., and Terebratula Deslongchampsii, nob
XXXVIII.—On the internal structure of Terebratula pectunculoides, Schl., Terebratula pulchella, Nils., and Terebratula Deslongchampsii, nob
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