. Bulletin - United States National Museum. Science. MIOCENE CALVERT MYSTICETES 111. Figure 45.—Anterior view of seventh cervical, ANSP 12692, of Eschrichtius cephalus Cope. Abbrs.: , diapophysis. except the basal portions of its pedicles, is missing. The anterior face of the anteroposteriorly compressed basal portion of the diapophysis is excavated and is inclined slighdy forward. The parapophysis was not developed. A greater relative width and a more elliptical anterior outline of the centrum distinguish the same cervical of Balaenoptera acutoTostrata from the seventh cervical of this fo
. Bulletin - United States National Museum. Science. MIOCENE CALVERT MYSTICETES 111. Figure 45.—Anterior view of seventh cervical, ANSP 12692, of Eschrichtius cephalus Cope. Abbrs.: , diapophysis. except the basal portions of its pedicles, is missing. The anterior face of the anteroposteriorly compressed basal portion of the diapophysis is excavated and is inclined slighdy forward. The parapophysis was not developed. A greater relative width and a more elliptical anterior outline of the centrum distinguish the same cervical of Balaenoptera acutoTostrata from the seventh cervical of this fossil mysticete. Measurements (in mm.) of the cervical vertebrae are as follows: CA Anteroposterior diameter of centrum Vertical diameter of centrum anteriorly Transverse diameter of centnmi anteriorly 20 103 22 108 22 110 118 120 120 29 108 137 Caudal vertebrae.—^Neither of the two caudal vertebrae listed by Cope (1868b, p. 149) are structurally unlike those of other mysticetes. The larger caudal, possibly the fourth or fifth, has the anterior and posterior haemal tubercles on either side of the longitudinal groove or channel for the caudal artery connected by an osseous isthmus. The distally eroded lateral tansverse processes projected outward more than 40 mm. beyond the centrum. The measurements (in nun.) of this caudal (ANSP 12941) are as follows: anteroposterior diameter of centrum, 131; transverse diameter of centrum anteriorly, 143; and vertical diameter of centrum anteriorly, 121. Forelimb The forelimb is relatively short, the combined length of the humerus and radius being slightly more than 27}^ inches (692 mm.) Cope states (1868b, p. 150) that the "forelimb was remarkably short, approaching the species of Balaena, and differing from E. robustus, still more from the Sibbaldii and Balaenopterae and most from Megaptera ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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