Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd in natural association ; and aScaphasjus-shs-iped shield occurs in the same beds as the type confirmatory evidence is obtained, we venture to regard thetransverse division of the lateral cornua in Diplaspis as accidental. Cyathaspis banksi (Huxley & Salter). [Plate IX. fig. 3.] 1856. Pteraspis banksii, Huxley & Salter, Quart. Journ. Geol. xh. p. 100; pi. ii. fig. 2. PTERASPID^E. 171 1858. Pteraspis banksii, T. II. Huxley, ibid. vol. xiv. p. 274, pi. Cyathaspis banksii, E. R. Lankester
Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd in natural association ; and aScaphasjus-shs-iped shield occurs in the same beds as the type confirmatory evidence is obtained, we venture to regard thetransverse division of the lateral cornua in Diplaspis as accidental. Cyathaspis banksi (Huxley & Salter). [Plate IX. fig. 3.] 1856. Pteraspis banksii, Huxley & Salter, Quart. Journ. Geol. xh. p. 100; pi. ii. fig. 2. PTERASPID^E. 171 1858. Pteraspis banksii, T. II. Huxley, ibid. vol. xiv. p. 274, pi. Cyathaspis banksii, E. R. Lankester, Rep. Brit. Assoc. 1864, Trans. Sect. p. Cyathaspis banksii, E. R. Lankester, Fishes Old Red Sandst. pt. i. (Pal. Soc.) p. 26, pi. ii. figs. 9-11, pi. iv. fig 6. Type. Dorsal shield ; unknown. The type species, the dorsal shield attaining a length of about005. Median disc oblong, strongly arched from side to side, trun-cated posteriorly, with a very small median spine; rostrum veryshort and broad ; lateral cornua extending from the orbits back- Fig. Outline of dorsal shield of Cyathaspis, restored by , cornua; d., median disc; o., orbit; r., rostral plate; s., dorsal spine. wards, broadest mesially, tapering behind, and not projecting beyondthe posterior margin of the disc. Superficial striae fine, those of therostrum transverse, the others longitudinal, and those of the discpartially subdivided into groups by irregular longitudinal costae. Form. § Loc. Upper Ludlow and Downton Sandstone: Here-fordshire. 45939. Small slab of Downton Sandstone, with casts of four im-perfect shields, one figured by Lankester, op. cit. pi. 6 ; Bradnor Hill, Kington. Lighibody Bequest. P. 684, P. 683. Ferruginous fossil shield, showing the coarse longi-tudinal costae of the disc with intervening fine striae ; alsoa cast of the inner aspect of part of a similar specimendisplaying some of the supposed branchial excavations andthe pineal pit; Downton Sandstone, Kingt
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