. Bulletin. Natural history; Natuurlijke historie. 108 PEABODY MUSEUM OF NATURAL HISTORY The vertex of the skull is flat except for the portion formed by the nasals. The nasals rise slightly above the narial openings but do not overreach them (as in Acrodelphis hakersfieldensis). The narial openings arc long and narrow, and somewhat elliptical in outline at the dorsal side, and approximately the same size. Each opening really consists of two parts, the narial passage itself, which is round and anterior in position, and the posterior part, which is an irregularly shaped depression lying behind
. Bulletin. Natural history; Natuurlijke historie. 108 PEABODY MUSEUM OF NATURAL HISTORY The vertex of the skull is flat except for the portion formed by the nasals. The nasals rise slightly above the narial openings but do not overreach them (as in Acrodelphis hakersfieldensis). The narial openings arc long and narrow, and somewhat elliptical in outline at the dorsal side, and approximately the same size. Each opening really consists of two parts, the narial passage itself, which is round and anterior in position, and the posterior part, which is an irregularly shaped depression lying behind the rounded anterior opening and having a floor lying a distance of 49 mm. below the top of the medial line of the nasals. Near the. foramen Fig. 23. Eurhinodelphis extensus (holotype), lateral view, x 1/3. For explanation of lettering, see Fig. 1. bottom of the posterior part, two vascular foramina appear as small holes. The distance from the posterior edge of the rounded anterior part to the rear of the irregular platform, measured in an antero-posterior direction, is mm. This platform, or floor, is formed by the mesethmoid. Only the upper portion of the supraoccipital is present. At its contact with the frontals, it forms a ridge which overhangs the supraoccipital posteriorly. Beneath this overhanging ridge, the supraoccipital descends nearly vertically for approximately 7 mm. and then slopes more gradually. The central portion of the supraoccipital is depressed and bordered laterally by ridges which extend to join the over- hanging ridge at the vertex. Several rugosities running dorso- ventrally occur in this depression, and one of them forms a ridge. 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 Peabody Museum of Natural History. New Haven : The Museum
Size: 2379px × 1051px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
