. Breviora. 1994 COCHLEOSA UR US FLORENSIS FROM NOVA SCOTIA 17. Figure 5. Cochleosaurus floremis Rieppel. Reconstruction of lower jaw in medial view, based primarily on MCZ 4342 with additional information from MCZ 4344. condition for early tetrapods. However, the bone surface of this apparent posteroventral extension bears a much closer resem- blance to that of the adjacent prearticular, suggesting that the latter has been broken into two longitudinal splints. A conser- vative reconstruction of the coronoids is presented here (Fig. 5), although the alternative interpretations already discusse
. Breviora. 1994 COCHLEOSA UR US FLORENSIS FROM NOVA SCOTIA 17. Figure 5. Cochleosaurus floremis Rieppel. Reconstruction of lower jaw in medial view, based primarily on MCZ 4342 with additional information from MCZ 4344. condition for early tetrapods. However, the bone surface of this apparent posteroventral extension bears a much closer resem- blance to that of the adjacent prearticular, suggesting that the latter has been broken into two longitudinal splints. A conser- vative reconstruction of the coronoids is presented here (Fig. 5), although the alternative interpretations already discussed cannot be dismissed unequivocally. A broadly rounded ridge, visible on the dorsal portion of the medial surface of the surangular, extends from its suture with the posterior coronoid to the mandibular condyle. There is a relatively large Meckelian fenestra at the common junction of the prearticular, postsplenial, and angular. Crushing makes it impossible to confirm the presence of more anterior fenestrae. The right ramus of MCZ 4344, preserved in ventral view, allows the mutual relationships of the angular, articular, surangular, and splenials to be determined (Fig. 3). The large, coarsely sculptured angular, occupying the posterior one-third of the ramus, forms a suture posteriorly and dorsally with the surangular. The latter is not exposed on the medial surface of the ramus, which is formed in this region by a lamina of the articular (Fig. 3). A reexamination of MCZ 4343 confirms this (contra Rieppel, 1980, text-figs. 1, 2). A 1-cm section is missing from the middle of the ramus of MCZ 4344, which otherwise is undisturbed. The dentary forms a broad contact posteriorly with a large postsplenial (splenial) that has an extensive, coarsely sculptured lateral exposure. A much smaller, splint-like splenial (presplenial) with only ventral and medial ex- posure and muted sculpturing occupies a position between these. Please note that these images are extracted from scanned page ima
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