. Bulletin. Natural history; Natuurlijke historie. 24 REVISION OF THE GYMNARTHRIDAE lar region, the prearticular flares medially forming an elongate, ventro- median depression. The angular forms the ventral border of the posterior third of the ramus and extends forward under the postsplenial in a long squamous suture. No large foramina or fenestrae other than the adductor fossa are visible on lateral or median surfaces of the ramus. Small nutrient foramina occur sparingly along the lateral surface of the dentary; in the larger Euryodus these are larger and more numerous. The structure of the l
. Bulletin. Natural history; Natuurlijke historie. 24 REVISION OF THE GYMNARTHRIDAE lar region, the prearticular flares medially forming an elongate, ventro- median depression. The angular forms the ventral border of the posterior third of the ramus and extends forward under the postsplenial in a long squamous suture. No large foramina or fenestrae other than the adductor fossa are visible on lateral or median surfaces of the ramus. Small nutrient foramina occur sparingly along the lateral surface of the dentary; in the larger Euryodus these are larger and more numerous. The structure of the lower jaw is fundamentally that of an amphibian, but with reptilian features, and resembles closely the controversial Pantylus. The major differences between the lower jaw of the latter and that of Cardiocephalus (and Euryodus) lies in speciahzation of the dentition, par- ticularly the transfer of major function from marginal to the coronoid dentition. NO. 1034, ARTICULATED SKELETON Through the kindness of the late Professor J. Willis S to vail of the Uni- versity of Oklahoma, and by courtesy of Professor Alfred S. Romer of Har- vard University (who also has studied this specimen but most kindly turned it over to us for description) it has been possible to examine and further expose this rare skeleton. Owing to the friable nature of the bone and rather brittle calcite matrix, full preparation was not attempted, but several charac- teristic regions of the vertebral column have been Figure 9. Cardiocephalus of. sternbergi Broili. A. nodule containing articulated skeleton, no. 1034. x 1. B. lateral view of mid-dorsal vertebrae of the same specimen, x 2 1/2 Skull: The skull (fig. 9A) has been somewhat flattened posteriorly so it appears broader in the temporal region than other specimens. Limits of cranial bones are clearly marked by matrix-filled sutures. The orbits have weakly outturned rims and conspicuous circumorbital grooves except on the postfrontal. A tra
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Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
