. Bulletin of the British Museum (Natural History) Geology Supplement. i8o ELOPIFORM FISHES nsp pu. Fig. 90. Lebonichthys gracilis (Davis). Caudal skeleton in left lateral view. Arrows indicate upper and lower principal fin-rays. Camera lucida drawing of (1901 : 16) quotes a figure of 20. The first two rays are unsegmeiited. The fifth ray is both the longest and the first branched. Of the 21 pterygiophores the first three support the first six fin-rays. With the exception of the first three, each pterygiophore consists of three distinct radial ossifications. The exceptional pt
. Bulletin of the British Museum (Natural History) Geology Supplement. i8o ELOPIFORM FISHES nsp pu. Fig. 90. Lebonichthys gracilis (Davis). Caudal skeleton in left lateral view. Arrows indicate upper and lower principal fin-rays. Camera lucida drawing of (1901 : 16) quotes a figure of 20. The first two rays are unsegmeiited. The fifth ray is both the longest and the first branched. Of the 21 pterygiophores the first three support the first six fin-rays. With the exception of the first three, each pterygiophore consists of three distinct radial ossifications. The exceptional pterygiophores exhibit fusion between the proximal and middle radials. The anal fin arises nearer to the caudal peduncle than to the pelvic fin and consists of nine rays supported on seven pterygiophores. The anterior two rays are un- segmeiited and the fourth is both the longest and the first branched. The caudal fin-rays are supported by five preural and two ural centra. Each of the preural centra is deeper than long and marked by ridges. The ural centra are smooth and largely overlapped by the uroneurals and the hypural heads. In the specimen figured (Text-fig. 90) the second ural centrum is completely obscured by the uro- neurals. The haemal spines of the five preural vertebrae become progressively stouter from the fifth to the first (the parhypural). The parhypural shows the characteristic. 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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