. Bulletin. Natural history. 36 PEABODY MUSEUM BULLETIN 23 foramina for the seventh and eighth nerves is larger and less well-defined. The lagena seems to lie wholly within the Text-fig. 14. Periotic labyrinth of Clidastes propylhon (YPM 1368, x 2). A. Anterior view of opisthotic. B. Posterior view of prootic. 3. Plotosaurus. According to Camp's (1942, pp. 5, 35, fig. 15) description and figure of the lateral wall of the braincase, the parietal ramus of the prootic is extensively overlapped by and firmly sutured to the descending wing of the parietal, a condition very different from
. Bulletin. Natural history. 36 PEABODY MUSEUM BULLETIN 23 foramina for the seventh and eighth nerves is larger and less well-defined. The lagena seems to lie wholly within the Text-fig. 14. Periotic labyrinth of Clidastes propylhon (YPM 1368, x 2). A. Anterior view of opisthotic. B. Posterior view of prootic. 3. Plotosaurus. According to Camp's (1942, pp. 5, 35, fig. 15) description and figure of the lateral wall of the braincase, the parietal ramus of the prootic is extensively overlapped by and firmly sutured to the descending wing of the parietal, a condition very different from that found in Clidastes. 4. Platecarpiis. Both the basisphenoidal and parietal rami of the prootic are distally expanded and much larger than in Clidastes. The otosphenoidal ala is usually small and poorly developed. The pit enclosing the foramina for the seventh and eighth nerves is small and deep and borders directly on the prootic- opisthotic suture. The medial wall of the prootic is anteroposteriorly shortened and the prootic incisure contacts the ventroanteriorly descending prominence lying in front of the above-mentioned pit; the incisure and pit are widely sepa- rated in Clidastes. The labyrinth is, however, identical to that of Clidastes (see Camp, 1942, fig. 25). 5. Tylosaunis. The most striking peculiarity of the lateral surface of the prootic in this genus is the enormous development of the otosphenoidal ala which broadly connects the basisphenoidal and suspensorial rami and covers the whole ventroposterior face of the prootic, inclucling even the anterodorsal. 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 Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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