. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Pterygoid^- process of <- jugal 7 / Pterygoid process of postorbital Crista supraoccipitolis Figure 4. Dorsal view of the skull of C. siebenrocki (AMS 40696). The labelled terms include new terms introduced in this paper and defined in Appendix I. Chelodina expansa, Figs. 1, 9). The neck is long and thick (Figs. 1, 9). Coloration is uniform dark brown to black on all dorsal surfaces, uniform yellowish white to tan on all ventral surfaces. The carapace lacks neural bones (Fig. 2). The skull is similar to C. oblonga,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Pterygoid^- process of <- jugal 7 / Pterygoid process of postorbital Crista supraoccipitolis Figure 4. Dorsal view of the skull of C. siebenrocki (AMS 40696). The labelled terms include new terms introduced in this paper and defined in Appendix I. Chelodina expansa, Figs. 1, 9). The neck is long and thick (Figs. 1, 9). Coloration is uniform dark brown to black on all dorsal surfaces, uniform yellowish white to tan on all ventral surfaces. The carapace lacks neural bones (Fig. 2). The skull is similar to C. oblonga, but the vomer does not usually separate the palatines (Fig. 5). The prefrontal spine is relatively prominent (Fig. 6). The hyoid has a clearly defined crista ventral is hyoideus (Fig. 8). EXTERNAL CHARACTERS Head, neck and limbs. Head flat, broad and elongate, covered on dorsal surface with fine reticulate pattern of skin creases giving the impression of numerous, small, irregularly-shaped scales. Creases absent from tympanum, maxilla, mandible, nasal region and a triangular area along the mid- line posterior to the orbits (Figs. 1, 9). Chin barbels present, variable in number; often four or more. Neck long and thick; approximately 75. Processus exopara- capsulons quadrati / Crista exopara- Capsulans Recessus scalae tymp'ani Aperture glossopharyngei Fenestra postotica Cbndylus occipitalis Figure 5. Ventral view of the skull of C, siebenrocki (AMS 40696). The labelled terms include new terms introduced in this paper and defined in Appendix I. per cent of length of carapace6, dorsal surface covered by irregular, flattened tubercles (Figs. 1, 9). Forelimbs with a single column of trans- verse, crest-shaped scales on dorsal surface, usually eight; but varying from six to 10. Similar scales on ventral surface of hind- limbs; usually arranged in two columns, with four to six in the medial column and eight to 12 in the lateral column; lateral column extends onto lateral edge of foot
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