. Bulletin du Museum of Comparative Zoology de Harvard College. Zoologie. Fig. 2. Vue postérieure de la vertèbre de même que ceux de la Figure 1. La large surface articulaire de la tuber- cukxm face ventrale et seulement légèrement lat généralement sur la surface des processus. Depuis le tuberculum est peu élevé, la partie proximale de la nervure continue hors- quartier dans la ligne de l'apophyse transverse. Les zygapophyses sont normalement construits, avec une très légère inclinaison médiane des surfaces articulaires. L'arcs neuraux, comme dans edapho- saurs en général, le manque d'excavation latérale vu dans sphena

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 2. Posterior views of the same vertebrae as those of Figure 1. The broad articular surface for the tuber- cukxm faces ventrally and only slightly lat- erally on the under surface of the process. Since the tuberculum is little raised, the proximal portion of the rib continues out- ward in the line of the transverse process. The zygapophyses are normally constructed, with a very slight median tilt of the articular surfaces. The neural arches, as in edapho- saurs generally, lack the lateral excavation seen in sphenacodontoids above the trans- verse processes. The neural spines, as in Casea, are slender transversely but long anteroposteriorly, and are low (although not as low, relatively, as in the last-named genus). In such mid-dorsals as are com- pletely preserved the rugose end of the spine is expanded laterally on either side and indented medially, to give a somewhat bifurcate appearance, much as in, for ex- ample, some parts of the En/ops column. CcrvicaJs. Progressing forward through the anterior dorsals into the cervical series, the vertebrae are increasingly lightly built, as tends to be true of pelycosaurs generally, but more especially of edaphosauroids, such as CotylorJiyncJws; in which the head is relatively small. The centra decrease steadily in diameter and length anteriorly, and the width tends to equal the length. In the 6th vertebra of 4-0-4, for example (Figs. IB, 2B), the length is about 50 mm, the. 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 work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum

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