Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Trochoceras (Lituites) giganteus, J. Sow. Fragment of Orthoceras Lud^nsi, J. Sow. Near Ludlow; also in the Aymestry and Leintwardine, Shror <stIre. Wenlock limestones, i nat. size. A species of Graptolite, G. Ludensis, Murch. (fig. 640, p. 559), a form of zoophyte or polyp which has not yet been met with in strata above the Silurian, occurs plentifully in the Lower Ludlow. Starfish, as Sir K. Murchison points out
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Trochoceras (Lituites) giganteus, J. Sow. Fragment of Orthoceras Lud^nsi, J. Sow. Near Ludlow; also in the Aymestry and Leintwardine, Shror <stIre. Wenlock limestones, i nat. size. A species of Graptolite, G. Ludensis, Murch. (fig. 640, p. 559), a form of zoophyte or polyp which has not yet been met with in strata above the Silurian, occurs plentifully in the Lower Ludlow. Starfish, as Sir K. Murchison points out, are by no means rare in the Lower Ludlow rock. These fossils present us with new genera, but they remind us of various living forms now found in our British seas, both of the families Asteriadce and Ophiuridce. Oldest hioivn fossil fish.—In 1855, when the last edition of this work was published, I was unable to cite any example of a fossil fish older than the bone-bed of the Upper Ludlow, but in 1859, a specimen of Pteraspis was found at Church Hill, near Leintwardine in Shrop- shire, by Mr. J. E. Lee of Caerleon, , in shale below the Aymes- try limestone, associated with fossil shells of the Lower Ludlow forma- tion—shells which differ considerably from those characterizing the Upper Ludlow already described. The genus Pteraspis, as we have seen (p. 532), is regarded by Prof. * Murchison's Siluria, p. 133. f Quart. Geol. Journ., vol. xix. p. 371, 1863.
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