. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. SCHULTZ: THE PROBOSCIS MONKEY 303 partly separate for a considerable time after the completion of the permanent dentition. c. Hip Bone. According to X-ray photographs of the proboscis monkey fetuses the innominate bone has only its three primary elements ossified during prenatal development and these are still widely sepa- rate. Even the bony rami of ischium and pubis do not become closed until about the time of birth. At the junction of the pelvic elements in the hip joint there is a separate os acetahuli in 4 out of
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. SCHULTZ: THE PROBOSCIS MONKEY 303 partly separate for a considerable time after the completion of the permanent dentition. c. Hip Bone. According to X-ray photographs of the proboscis monkey fetuses the innominate bone has only its three primary elements ossified during prenatal development and these are still widely sepa- rate. Even the bony rami of ischium and pubis do not become closed until about the time of birth. At the junction of the pelvic elements in the hip joint there is a separate os acetahuli in 4 out of 7 juveniles. These elements fuse during the last brief phase of dental eruption, the pubis remaining separate slightly longer than the ilium and ischium, NEWBORN. ADULT cf Fig. 5. The sternum in proboscis monkeys of different ages. Dotted areas cartilage. the acetabular lines of separation for the pubis being still visible in one fully adult specimen. This agrees very closely with the correspond- ing findings for the great apes (Schultz, 1941), but differs from these conditions in man in whom the pehac elements fuse long before the second dentition is completed. The epiphyses on the ischial tuberosi- ties loose their separate existence early in adult life, but the bony rims on the iliac crests remain separate, at least in their middle portions, for a considerable time after adulthood has been attained. The pubic symphysis was found open in all specimens, except one old male in which it had become solidly closed along its uppermost third. d. Shoulder Girdle. The sternal epiphysis of the cla\dcle does not become fused until adult life. It is uncertain just when it does close in. 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
Size: 771px × 3241px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
