. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 288 BULLETIN : MUSEL^M OF COMPARATIVE ZOOLOGY Skull broad, a single feeble ridge on the triturating surface of the maxilla. Premaxillae separating maxillae and reaching the choanal margin. Vomer absent. No pre- columellar fossa in cavum tympani. Width of cavum tympani about equals width of orbit. InterorbitaJ width less than height of Fig. 5. Palate of skull in P. sextuherculata. Abbreviations: mx, maxilla; pal, palatine; pm, premaxilla. Head secies: Interparietal scale usually widely separating parietal scale
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 288 BULLETIN : MUSEL^M OF COMPARATIVE ZOOLOGY Skull broad, a single feeble ridge on the triturating surface of the maxilla. Premaxillae separating maxillae and reaching the choanal margin. Vomer absent. No pre- columellar fossa in cavum tympani. Width of cavum tympani about equals width of orbit. InterorbitaJ width less than height of Fig. 5. Palate of skull in P. sextuherculata. Abbreviations: mx, maxilla; pal, palatine; pm, premaxilla. Head secies: Interparietal scale usually widely separating parietal scales. Large suboculars present. Barbels: two. Foot scales: Three. Sise to 310 mm P. sextuberculata CJornalia (Amazonian region) Vertebral keel never raised, into a swelling at the posterior margin of vertebral two, shell often with concentric ridges. Hatchling never with three pairs of lateral swellings on the plastron 5 5. Vertebral keel usually distinct, typically most prominent on vertebral three; posterior shell margin somewhat expanded; shell commonly concentrically ridged. Size known to exceed 600 mm. Upper jaw distinctly notched. Skull elongate with two ridges on the triturating surface of the maxilla, the in- ternal ridge not sharply dentate. Temporal region of skull strongly emarginate both dorsally and ventrally. Vomer usually absent. Shell with a distinct nuchal indentation. Hatchlings with vertebral two usually only as long as vertebral tliree and with the plastron completely yellow or without a definite plastral 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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