Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig. 170. Amphitetras antediluviana. Amphitetras is represented by one species, ofwhich we give a figure (fig. 170). In this genus thevalve is quadrangular, the somewhat tumid anglesfaintly marked, and looking like openings, the cubi-form frustules cohering into a zigzag attachedfilament (fig. 171).

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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience