. Carnegie Institution of Washington publication. 1)1' KM.\ I I \h . 26l The specimen is a complete shell, extremely little damage having been done to either the carapace or the plastron through loss or any part. Unfortunately, however, an extremely compact clayey limestone has envelopt the shell, and this clings so closely to the bone that it very difficult to remove it. In addition to this, there had been deposited over considerable portions of the shell scattered nodular masses of hematite, which became so thoroly attacht to the bone that, in removing them, the surface of the bon
. Carnegie Institution of Washington publication. 1)1' KM.\ I I \h . 26l The specimen is a complete shell, extremely little damage having been done to either the carapace or the plastron through loss or any part. Unfortunately, however, an extremely compact clayey limestone has envelopt the shell, and this clings so closely to the bone that it very difficult to remove it. In addition to this, there had been deposited over considerable portions of the shell scattered nodular masses of hematite, which became so thoroly attacht to the bone that, in removing them, the surface of the bone was somewhat injured. This condition has resulted in making it very difficult to determine the position and courses of some of the sutures between the bones, and likewise the impressions between the different epidermal scutes. Many of the bone sutures could be determined onlv by removing, by means of hydrochloric acid, a thin layer of bone so that the matrix in the sutures projected a little. The obdurate nature of the matrix which fills the shell has seemed to render it inadvisable to attempt to remove it for the purpose of seeing characters found on the inside of the shell. The specimen has been carefully studied and the various sutures and sulci have been represented in the figures herewith provided. As to the bone sutures, they have been satis- factorily made out and may be relied upon. Many of the epidermal sulci have been more difficult to determine; but in general, it is believed that they are correctly 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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