USNM 95133-34 (carapaces and plastrons only) and TU 17236 are females, which lack the diagnostic spotted pattern of _calvatus_; the former are referred to this subspecies on geographic grounds (Pearl River at Columbia, Mississippi). [Please select]
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They are the locomotive organs of the young embryo, and they gradually extend until they respectively enclose nearly the whole of the upper and lower half of the body, forming two large shields or plastrons. [Please select]
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