The Victoria history of the county of Cornwall . and prove, as already mentioned,that the Cornish species is correctly described under the name ofP. cornubica. It seems to be the largest species of the genus hithertodiscovered It may be added that in Western Europe Pteraspis is characteristiconly of the Lower Devonian or Lower Old Red Sandstone, not descendingbelow the base of this formation, where it is preceded by [forms with] asimple shield, Cyathaspis. In Galicia, however, typical species occur instrata which are claimed to be of Downtonian or even Ludlow age. Fragmentary remains probably
The Victoria history of the county of Cornwall . and prove, as already mentioned,that the Cornish species is correctly described under the name ofP. cornubica. It seems to be the largest species of the genus hithertodiscovered It may be added that in Western Europe Pteraspis is characteristiconly of the Lower Devonian or Lower Old Red Sandstone, not descendingbelow the base of this formation, where it is preceded by [forms with] asimple shield, Cyathaspis. In Galicia, however, typical species occur instrata which are claimed to be of Downtonian or even Ludlow age. Fragmentary remains probably of Cephalaspis have also been foundwith these Pteraspidians ^ ; and some associated plates may belong to theArthrodiran Phlyctaenaspis? Rep. Brit. Assoc, for 1843, ^rans. Sect. p. 56. * Geol. Mag. v, 247 (1868). Ibid. 248. * Trans. Roy. Geol. Soc. Corntvall, xii, pt. 4 (1899). ^ Misprinted complete in the original, * A. Smith Woodward, Trans. Roy. Geol. Soc. Cornwall, xii, pt. vi (1901). A. Smith Woodward, Geol. Mag. [4] vii, p. 148 (1900). 48. HISTORY OF CORlfWALl. BOTANICAL DISTRICTS SCILILYISJLES On Uie same scale
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