. The Canadian field-naturalist. Natural history. 2003 MacNaughton: Planispiral Burrows 579. Figure 2: Photographs of the planispiral burrows. Lens cap is 56 mm in diameter. (A) Burrow with slight!) raised cental area and progressively more open outward coiling. Note possible continuation of burrow toward bottom ot photograph. (B) Planispiral burrow near top of photograph shows tight, slightl) irregular coiling and continues to left of picture as a simple, horizontal burrow (indicated b\ arrow). Example near bottom of photograph displays coils that become less tight outward and a raised centra
. The Canadian field-naturalist. Natural history. 2003 MacNaughton: Planispiral Burrows 579. Figure 2: Photographs of the planispiral burrows. Lens cap is 56 mm in diameter. (A) Burrow with slight!) raised cental area and progressively more open outward coiling. Note possible continuation of burrow toward bottom ot photograph. (B) Planispiral burrow near top of photograph shows tight, slightl) irregular coiling and continues to left of picture as a simple, horizontal burrow (indicated b\ arrow). Example near bottom of photograph displays coils that become less tight outward and a raised central area. Note horizontal burrow with apparent branches extending from centre of photograph to top Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
