. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Cristo jugalis Cavum tympani Post-otic antrum Precolumellar fossa Fenestra hyoideus iall Figure 6. Lateral view of the skull of C. siebenrocki (AMS 40696). The labelled terms include new terms introduced in this paper and defined in Appendix I. midline in very large females. Surface of carapace weakly rugose with reticulate pattern of numerous, very shallow furrows. Furrows on vertebrals oriented longitudi- nally along midline; furrows on pleurals not oriented in any particular way. Length of dorsal surface of nuchal
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Cristo jugalis Cavum tympani Post-otic antrum Precolumellar fossa Fenestra hyoideus iall Figure 6. Lateral view of the skull of C. siebenrocki (AMS 40696). The labelled terms include new terms introduced in this paper and defined in Appendix I. midline in very large females. Surface of carapace weakly rugose with reticulate pattern of numerous, very shallow furrows. Furrows on vertebrals oriented longitudi- nally along midline; furrows on pleurals not oriented in any particular way. Length of dorsal surface of nuchal scute usually greater than width, averaging in length: width ratio. All 27 specimens examined had fully formed nuchal scutes. Width of ven- tral surface of nuchal scute greater than length, averaging in length:width ratio (Fig. 3). Anterior ventral marginals form a narrow rim between edge of carapace and attachment of skin from dorsal surface of neck; carapace averages times longer than width of second ventral marginal. Width of fifth vertebral greater than length, with the length:width ratio averaging Shape of pleurals and first four vertebrals apparently not significant. Twelve marginals on each side of carapace; fifth marginal always in contact with first pleural; eleventh marginal usually in broad contact with fifth vertebral (Figs. 1, 2, 9). Plastron. Plastron fairly elongate and narrow (Figs. 1, 3). Carapace width av- eraging times plastron width; carapace length averaging times plastron width; length of plastron itself averaging Corpus hyoideus. Figure 7. Medial and slightly ventral view of the right side of the mandible of C. siebenrocki (AMS 40696). Figure 8. Ventral view of the hyoid of C. siebenrocki (MCZ 118611). times width. Plastron shorter than carapace, with carapace length averaging times plastron length (Fig. 3). Anterior lobe generally much narrower than posterior lobe and tapering anteriorly to end in a blunt point (F
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