. Bulletin of the British Museum (Natural History), Geology. 28 ICHTHYOKENTEMA PURBECKENSIS bone and emerged immediately below the lower of the two projections on the head of the bone. The surface of the supracleithrum is ornamented with feeble ridges. The cleithrum (cl.) (P. 44966) is the usual large sigmoid bone. The anterior edge of the bone is thickened, and from the middle part of it a flange extends antero-. 5mm. Fig. 13. Ichthyokentema purbeckensis. Reconstruction of pectoral girdle of right side in medial view. The supracleithrum and postcleithra are displaced posteriorl
. Bulletin of the British Museum (Natural History), Geology. 28 ICHTHYOKENTEMA PURBECKENSIS bone and emerged immediately below the lower of the two projections on the head of the bone. The surface of the supracleithrum is ornamented with feeble ridges. The cleithrum (cl.) (P. 44966) is the usual large sigmoid bone. The anterior edge of the bone is thickened, and from the middle part of it a flange extends antero-. 5mm. Fig. 13. Ichthyokentema purbeckensis. Reconstruction of pectoral girdle of right side in medial view. The supracleithrum and postcleithra are displaced posteriorly. For explanation of lettering see p. 43. medially to form the hind edge of the opercular opening. Dorsally the bone tapers to a point which lay medial to the ventral end of the supracleithrum. The exposed lateral face of the cleithrum is ornamented with a few vertical ridges. The endoskeletal pectoral girdle (PI. 4, fig. 10) (P. 44966-68) is ossified in a single piece, with no sign of sutures between the scapular, coracoid and mesocoracoid elements. There is a very large scapular foramen () in the centre of the scapular region, and the foramen is divided horizontally by a strut of bone which passes. 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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