. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. i c. Figure 13. Echinerpeton intermedium. A, two fragmentary neural arches, MCZ 4094; B, interclavicle, MCZ 4091; C, three presacral vertebral elements; X, skeletal elements belonging to a small romeriid, MCZ 4091. All X 1- \o intercentra were found in the deposits that could possibh- be identified as be- longing to this genus. The neural arches do not sIkjw the type of excavation at the base of the spines seen in the more advanced sphenacodonts (Fig. 13). The zygapophyses do not have strongly tilted articular surface
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. i c. Figure 13. Echinerpeton intermedium. A, two fragmentary neural arches, MCZ 4094; B, interclavicle, MCZ 4091; C, three presacral vertebral elements; X, skeletal elements belonging to a small romeriid, MCZ 4091. All X 1- \o intercentra were found in the deposits that could possibh- be identified as be- longing to this genus. The neural arches do not sIkjw the type of excavation at the base of the spines seen in the more advanced sphenacodonts (Fig. 13). The zygapophyses do not have strongly tilted articular surfaces, nor are they as close to the midline as in typical sphenacodonts. In mid-dorsals, the angle of the zygapophyses is estimated to be about 35 degrees. In most ophiacodonts the angle is approximateh- 30 degrees, while in most sphenacodonts it is about 45 degrees. The transverse processes are relatively high on the anterior portion of the neural arch. In the cervicals thev tend to point strongly downward, so that the\' appear as lateral bulges on the neural arch. From the anterior dorsal region to the 23rd pre- sacral, all the ti-ansverse processes extend far lateralh-, and tip genth' downward. Their tubercular facets are shaped in a fashion similar to that seen in ophiacodonts,. 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
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