The two pleurocentra of each vertebra are separate ventrally as well as dorsally, but form thin, broad plates of about the same height as the notochord. The lateral surface appears to be depressed, allowing, perhaps, for movement of the rib. Above each pleurocentrum, on the lateral surface of the neural arch, there is a short diapophysis for articulation with the tuberculum of the rib. The margin of the neural spine is convex anteriorly and concave posteriorly, the tip reaching a point vertically above the postzygapophysis. The prezygapophysis of each vertebra articulates with the preceding postzygapophysis by a smooth dorsal surface. One nearly complete neural arch shows (Fig. 7 B) a pit above the neural canal, clearly corresponding to the canal for a dorsal ligament shown by Jarvik in _Ichthyostega_. Indeed this view of the neural arch and intercentrum together brings out the striking resemblance between the vertebrae of _Hesperoherpeton_ and those of the Ichthyostegids. The rounded intercentrum in both is an incomplete ring enclosing the notochordal canal. [Illustration: FIG. 7. _Hesperoherpeton garnettense_ Peabody. A, End view of incomplete vertebra, probably near anterior end of column. B, Neural arch and intercentrum in end view, showing probable association. C, Left lateral view of trunk vertebra. All figures: KU 10295, × 4.] TABLE 1.--AVERAGE MEASUREMENTS OF THE TRUNK VERTEBRAE (in mm.). NUMBERS IN PARENTHESES INDICATE THE NUMBER OF PIECES AVAILABLE FOR MEASURING ----------------------------+------------+-------------+--------------- PARTS | Ant.-post. | Dors.-vent. | Transv. width ----------------------------+------------+-------------+--------------- Neural spine | 1.5 (3) | 3.0 (3) | -- ----------------------------+------------+-------------+--------------- Neural spine and arch | 2.0 (4) | 4.5? (4) | -- ----------------------------+------------+-------------+--------------- Neural canal | 2.0 (4) | 2.0 (1) | 1.0 (1) ----------------------------+------------+-------------+--------------- Intercentrum | 1.5 (5) | 3.5 (4) | 3.0 (1) ----------------------------+------------+-------------+--------------- Pleurocentrum | 1.5 (3) | 3.0 (2) | -- ----------------------------+------------+-------------+---------------