Systematic Lists Illustrative of the Flora, Fauna, Palaeontology, and Archaeology of the North of Ireland Volume 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 Excerpt: ...Mag. 1873, p. 558.) 84. Sp. I. Leptograptus flaccidus. Hall. PI. 7, fig. 14. Localities--Car nalea, Orlock Point, and Ballygrot. Genus XV. Cojnograptus. Hall. (Modified.) (Hall, Annual Report, 1867, p. 179.) So far as at present known this genus differs from Pleurograptus (Nich.), in the possession of an initial cross-bar, formed by the persistent sicula. 85. Sp. 1. Canograptus gracilis. Hall. PI. 7, fig. 11. Localities--Bally grot and Craigavad. None of the Scottish examples of this species give evidence of having been composed of four branches, as indicated in the American specimen figured by Hall. (Grapt. Quebec Group, p. 14.) 86. Sp. 2. Caiwgraptus surculatis. Hall. PI. 7, fig. 12. Locality--Bally grot. 87. Sp. 3. Canograptus pcrtenuis. Lapw. PI. 7, fig. 13. (Catl. Western Scottish Fossils, 1876. PI. 3, figs. 66, 67.) Polypary consisting of two simple or compound monoprionidian flexuous and extremely slender branches, proceeding in opposite directions from the central portion of a well-marked sicula. Hydrotheca 16 to the inch, of the type of those of Canoraptus gracilis, The forms C. explanatus, and C. nitidulus figured by myself in the Catl. Western Scott. Fossils may be distinct species, or merely varieties of the present form. It will consequently be better to defer their description till this point has been satisfactorily determined. Locality--Ballygrot. Genus XVI. Thamnograptus. Hall. 88. Sp. I. Tftamnograptus tvpus t Hall. PI. 7, fig. 16. This form has only been procured in small fragments in the dark shales of County Down. It occurs locally in great profusion in the Glenkiln Beds of the South of Scotland. Some comparatively perfect and well preserved examples from these beds lately added to my collection, make it clear that different portions of ...