. Bulletin. Science; Natural history; Natural history. ll ' A's/m AND PROl YO IDS. Figure 3. Right calcanea of members of the Ursidae. a, Ursus maritimus; b, U. americanus; c. Melursus ursinus; d, Helarctos malayanus; e. Trcmarctos oniatus; f. Selenarctos thibctanus; g, t/. arctos; h. showing distance from outer edge of trochlear shelf to center of inner edge of posterior articular surface in Ursus americanus; i, notch between posterior articular surface and trochlear process in Ailiiropoda melanoleuca; j. Ailuropoda melanolcuca. shelf formed by the trochlear process (Fig. 3f). Specimens exami
. Bulletin. Science; Natural history; Natural history. ll ' A's/m AND PROl YO IDS. Figure 3. Right calcanea of members of the Ursidae. a, Ursus maritimus; b, U. americanus; c. Melursus ursinus; d, Helarctos malayanus; e. Trcmarctos oniatus; f. Selenarctos thibctanus; g, t/. arctos; h. showing distance from outer edge of trochlear shelf to center of inner edge of posterior articular surface in Ursus americanus; i, notch between posterior articular surface and trochlear process in Ailiiropoda melanoleuca; j. Ailuropoda melanolcuca. shelf formed by the trochlear process (Fig. 3f). Specimens examined: AMNH 14058 (yg). 156S6-7 (yg). 22885. 75244-5. 100039 (AMNH 22885 illustrated. Fig. 3a). Ursus arctos—Brown Bear The calcaneum of Ursus arctos is extremely variable in size within and between different age groups. In 20 adults the range is from mm (avg. ) in length, and two young (greater tuberosity not completely ossified) range from mm. In width of calcanea. adults range from (avg. mm), and six young range from (avg. mmi. The larger specimens come from Alaska, the smaller calcanea come from brown bears of western United States and are less than S5 mm in length and less than 55 mm in width. The brown bear (Fig. 3g) can be distinguished from the polar bear (Fig. 3a) because of the greater proximal expansion of the trochlear pro- cess in the brown bear. In Ursus maritimus. the proximo-distal length of the trochlear process is from (avg. ) percent of the width and in the brown bear. (avg. ) percent. This ratio will separate both young and adult polar bears from brown 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
Size: 1700px × 1470px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
