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Glossograptus cf ciliatus Hincksii var ﬁmbriatus a rma tus acanthus Table of Species of Retiograptus Geinitziamus aculeatus
Lasiograptus Subgenus Hallograptus Hallograptus mucronatus var inutilis var bilmlcronatus var nobilis Subgenus Thysanograptus Thysanog...
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angle apertural margins apertural region appears Arenig associated axis Barrande beds Birkhill Birkhill Shales biserial portion branches British cells characteristic characters classiﬁcation Coll common canal concave conspicuous curvature curved Dendroidea described and ﬁgured developed Didymograptus Diplog Diplograptus distal distal thecae diverging Dobb’s Linn ﬁgs ﬁrst ﬁrst theca ﬂexed fossil genera genus Geol Grapt Graptolites Graptolithus Hall Hall’s Hartfell Hartfell Shales Hist Hopkinson Horizon Hydrozoa inclined Journ Lake District Lapw Lapworth length Llanbrynmair Llandeilo Llandovery long as wide Lower main stipes maximum breadth Monog Monograptus narrow Nicholson Nilssoni obverse occurs Ordovician origin overlap Plate polypary priodon proximal end proximal portion Quart Rastrites recognised resembles Retiolites reverse aspect Scotland Sedgwick Museum Shales Shales zone sicula Silurian Skiddaw Slates slender slightly species of Graptolites speciﬁc specimens straight structure thecae Tornquist uniserial Upper ventral virgella virgula Wales walls widening width