. Bulletin of the British Museum (Natural History) Geology Supplement. inii UPPER CRETACEOUS TELEOSTS The supracleithrum is long and narrow, with an antero-posteriorly elongated head. The lateral line canal passed straight through the head of the supracleithrum within a tube. Ventrally the supracleithrum lies against the upper lateral face of the cleithrum, and here the supracleithrum bears several vertical striations on its lateral 5mm Fig. 46. Eurypholis boissieri Pictet. Pectoral girdle of the right side in lateral view. The cleithrum (post-clavicular plate of Woodward, 1901 : 208, f
. Bulletin of the British Museum (Natural History) Geology Supplement. inii UPPER CRETACEOUS TELEOSTS The supracleithrum is long and narrow, with an antero-posteriorly elongated head. The lateral line canal passed straight through the head of the supracleithrum within a tube. Ventrally the supracleithrum lies against the upper lateral face of the cleithrum, and here the supracleithrum bears several vertical striations on its lateral 5mm Fig. 46. Eurypholis boissieri Pictet. Pectoral girdle of the right side in lateral view. The cleithrum (post-clavicular plate of Woodward, 1901 : 208, fig. 7) is a very large and characteristically shaped bone. The anterior margin is inclined medially where it forms the posterior boundary of the branchial opening, and the lateral face is greatly expanded both anteriorly and posteriorly, particularly in the ventral region. The anterior termination of the cleithrum lies medial to the extreme ventral end of the preoperculum, and the posterior end of the cleithrum extends for a considerable distance backwards below the pectoral fin. Both of these extremities are acutely pointed. The ventral region of the cleithrum, as well as being expanded anteriorly and posteriorly, is also inflected strongly towards the mid-ventral line of the body, approaching its partner from the opposite side. The whole external face of the cleithrum is ornamented with the characteristic tubercles, which are most prominent near the anterior and the ventral edges. Dorsally the cleithrum tapers and lies medial to the supracleithrum. The endoskeletal girdle attaches to the internal face of the cleithrum, but owing to the great expansion of the cleithrum its outlines are not determinable: a large. 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 British Museum (Natural History). London : BM(NH
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