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Description of four new genera of Thraulus group mayflies from the eastern hemisphere and redescription of Simothraulus and Chiusanophlebia (Ephemeroptera: Leptophlebiidae: Atalophlebiinae)
XII. An anatomical account of the Squalus maximus (of Linnæus), which in the structure of its stomach forms an intermediate link in the gradation of animals between the whale tribe and cartilaginous fishes