. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. boundary of the large vertical occipital foramen, and thickened and smoothly rounded to form the inferior extremities of the two occipital con- dyles. These condyles are principally deve- loped from the ex-occipital elements (Jigs. 169, 171, 6, 6), which are expanded superiorly and terminate in an angle wedged in between the supra-occipital and petrous bones; they extend, but do not meet, above the occipital foramen, being separated by a notch closed by membrane in the recent state. The supra- occipital element (Jigs. 16
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. boundary of the large vertical occipital foramen, and thickened and smoothly rounded to form the inferior extremities of the two occipital con- dyles. These condyles are principally deve- loped from the ex-occipital elements (Jigs. 169, 171, 6, 6), which are expanded superiorly and terminate in an angle wedged in between the supra-occipital and petrous bones; they extend, but do not meet, above the occipital foramen, being separated by a notch closed by membrane in the recent state. The supra- occipital element (Jigs. 169 & 171, c) is a transversely oblong quadrilateral plate of bone; its short lateral margin is joined by a linear harmonia with the upper part of the os petro- sum, on each side; the wide anterior mar- gin is similarly articulated with the single parietal bone, and is slightly overlapped by its posterior margin; this representative of the deltoid suture runs straight across the posterior and upper part of the skull. Fig. Occipital and sphenoidal cranial vertebrae, setosa. (Original.) * See L89ns d'Anatomie Comparee, Ed. 1837. VOL. III. Occipital region of skull, Echidna setosa. (Original.) In the specimen in which the preceding condition of the occipital vertebra was mani- fested there was no trace of sagittal suture; the upper and middle region of the cra- nium was covered by a single broad, slightly convex, parietal bone, (Jig. 169, </,) joined Echidna posteriorly, as above described, with the supra- occipital, laterally with the petrous and sphe- noid bones, and anteriorly with the sphenoid and frontal bones, which the parietal overlaps 2 B. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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