Catalogue of the fossil fishes in the British Museum (Natural History) .. . Similar specimen, with rostrum relatively shorter and moreacutely pointed. Purchased, 1888. P. 5971. Fragment with rostrum. Purchased, 1889. P. 5480. Imperfect impression of inner aspect of shield, with theinferior rim. Purchased, 1888. P. 5971 a. Fragment showing part of the hinder border of theshield. Purchased, 1889. P. 5974. Fragmentary squamation, probably of this species. Thescales are ornamented with very fine tubercles often fusedin series. Purchased, 1889. 192 OSTEOSTRACI. Cephalaspis dawsoni, Lankester. 1S70.
Catalogue of the fossil fishes in the British Museum (Natural History) .. . Similar specimen, with rostrum relatively shorter and moreacutely pointed. Purchased, 1888. P. 5971. Fragment with rostrum. Purchased, 1889. P. 5480. Imperfect impression of inner aspect of shield, with theinferior rim. Purchased, 1888. P. 5971 a. Fragment showing part of the hinder border of theshield. Purchased, 1889. P. 5974. Fragmentary squamation, probably of this species. Thescales are ornamented with very fine tubercles often fusedin series. Purchased, 1889. 192 OSTEOSTRACI. Cephalaspis dawsoni, Lankester. 1S70. Cephalaspis daiosoni, E. R. Lankester, Geol. Mag. vol. vii. p. 397,woodcut. Type. Head and trunk • Redpath Museum, Montreal. A small species, known only by the type specimen. Shield muchbroader than long, with prominent cornua; surface very finely tu-berculated. Scaly trunk remarkably small and slender in proportionto the shield ; infero-lateral scales with serrated free border. Form. Sf Loc. Lower Devonian : Gaspe, Canada. Not represented in the Collection. Fig. Cephalaspis dawsoni, Lank.—Dorsal aspect (1), nat. size, and a portion of thetubercular ornament (2), much magnified, after Lankester. Lower Devo-nian, Canada. [Redpath Museum, Montreal.] Cephalaspis laticeps, Traquair. 1890. Cephalaspis laticeps, R. H. Traquair, Geol. Mag. [3] vol. vii,p. 16. Type. Shield with remains of squamation; Edinburgh Museum. CRPHALA8PID/E. 193 Shield proportionately rather broad; cornua short, orbits ratherclose together, oval, large; tesselated divisions of middle layer verysmall; external surface ornamented by small, smooth, polished androunded tubercles, moderately close in position. (Traquair.) The shield in the type specimen measures 0*034 in length and0-069 in breadth. Form. Sf Loc. Upper Devonian: Scaumenac Bay, P. Q., Canada. Not represented in the Collection. A fragment apparently of the shield of Cephalaspis, from theLower Devonian of Dickson Bay, Spitzbergen, is recorded
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