. On the anatomy of vertebrates [electronic resource] . cal and longi-tudinal directions, but most so in the Virginian and Crab-eatingOpossums, fig. 217, where it increases in thickness posteriorly;in these species also the third, fourth, and fifth cervical vertebrae have their spines remarkably long andthick, but progressively diminishingfrom the third, fig. 218, which equalsin height and thickness, but not inlongitudinal extent, the spine of thedentata. These spines are four-sided,and being closely impacted together,one behind another, must add greatlyto the strength, while they diminishthe
. On the anatomy of vertebrates [electronic resource] . cal and longi-tudinal directions, but most so in the Virginian and Crab-eatingOpossums, fig. 217, where it increases in thickness posteriorly;in these species also the third, fourth, and fifth cervical vertebrae have their spines remarkably long andthick, but progressively diminishingfrom the third, fig. 218, which equalsin height and thickness, but not inlongitudinal extent, the spine of thedentata. These spines are four-sided,and being closely impacted together,one behind another, must add greatlyto the strength, while they diminishthe mobility, of this part of the structure of the transverse pro-cesses of the cervical vertebrae, , d, is also adapted to the strength-ening and fixation of this part of thevertebral column: they are expanded nearly in the axis of thespine, but so that the posterior part of one transverse process overlaps the anterior part ofthe succeeding. This struc-ture is exhibited in a slighterdegree in the cervical verte-brae of the Dasyures, Pha-. Atlas, axis, and third cervical vertebra,Koala. 217 218
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