. Bulletin. Natural history. fig. 9. Sagittal sections through the axes of opposum pouch young (Didelphis marsupialis). Upper photograph, 20 days post partum (Wistar Institute Scr. Cat. no. 17683), approx. X35. The two adjacent zones of hypertrophicd chondrocytes represent the axis centrum (left) and "atlas centrum" (right). Arrow indicates developing dens. Below and to the right of the arrow is a section through the ventral half of the atlas ring ("atlas intercentrum" ). Lower photograph, 25 days post partum, approx. X40. The two adjacent zones of ossification represent th
. Bulletin. Natural history. fig. 9. Sagittal sections through the axes of opposum pouch young (Didelphis marsupialis). Upper photograph, 20 days post partum (Wistar Institute Scr. Cat. no. 17683), approx. X35. The two adjacent zones of hypertrophicd chondrocytes represent the axis centrum (left) and "atlas centrum" (right). Arrow indicates developing dens. Below and to the right of the arrow is a section through the ventral half of the atlas ring ("atlas intercentrum" ). Lower photograph, 25 days post partum, approx. X40. The two adjacent zones of ossification represent the axis centrum (left) and "atlas centrum" (right). The cartilaginous extension of the atlas centrum over the atlas ring represents the dens. For abbreviations see Fig. 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, Peabody Museum of Natural History, Yale University
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