Catalogue of the fossil fishes in the British Museum (Natural History) .. . i. vi. figs. Platysomus intermedins, H. B. Geinitz, ibid. p. 9. 543 1861. Platysomus rhombus, II. B. Geinitz, ibid. p. Platysomus striatus, H. B. Geinitz, ibid. p. Platysomus striatus, R. H. Traquair, Trans. Roy. Soc. xxix. p. 369, pi. vi. figs. 1, 2. Type. Fish ; Paris Museum of Natural History. The type species, attaining a maximum length of about 0* depth of trunk somewhat exceeding its length from thepectoral arch to the base of the caudal fin ; dorsal
Catalogue of the fossil fishes in the British Museum (Natural History) .. . i. vi. figs. Platysomus intermedins, H. B. Geinitz, ibid. p. 9. 543 1861. Platysomus rhombus, II. B. Geinitz, ibid. p. Platysomus striatus, H. B. Geinitz, ibid. p. Platysomus striatus, R. H. Traquair, Trans. Roy. Soc. xxix. p. 369, pi. vi. figs. 1, 2. Type. Fish ; Paris Museum of Natural History. The type species, attaining a maximum length of about 0* depth of trunk somewhat exceeding its length from thepectoral arch to the base of the caudal fin ; dorsal margin angulatedabout its middle point; ventral margin angulated considerably be-hind its middle point. Length of cranial roof with post-temporalbone about equal to the distance between the latter and the dorsalangulation; head with opercular apparatus and pectoral archoccupying about one-third of the total length of the fish to the baseof the caudal fin. Pelvic fins very small, remote ; dorsal and analfins arising at the dorsal and ventral angulations respectively, ex-. Platysomus gibbosus (Blainv.).—Eestoration by E. H. Traquair. tending close to the origin of the caudal fin, and not much elevatedin front, the maximum height of the dorsal less than one quarterthe depth of the trunk at its origin ; width of caudal fin at extremityequalling about two-thirds the maximum depth of the trunk. Scalesfinely striated, the striae being oblique on all those situated dorsallyand ventrally and in the caudal region, but nearly vertical on thedeeper flank-scales; the ornament on the scales of the dorsal andventral borders more or less tuberculated. Yertical series of scalesat base of anal fin reflexed forwards. Measurements of several specimens show that there is no difference 544 ACT1N0PTEKYG11. in the relative proportions of the head between the Kupferschieferfossils and those named striates from the English Marl Slate; andin all these fishes the scale-ornament is identical. The rounde
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Keywords: ., bookauthorbritishmuseumnaturalh, bookcentury1800, bookdecade1880
