Page:The Habitat of the Eurypterida.djvu/141

Rh In beds of the same series in this section the following marine organisms have been obtained, according to Peach and Horne:


 * Amphispongia sp.
 * Nidulites favus Salt.
 * Dictyonema venustum Lapw.
 * Dictyonema (Chondrites) verisimile Salt.
 * Cyrtograptus murchisoni ? Carr.
 * Monograptus priodon Bronn.
 * Monograptus vomerinus Nich.
 * Favosites sp.
 * Tentaculites tenuis Sow.
 * Palasterina sp.
 * Crinoid fragments.
 * Lingula lewisi Sow.
 * Lingula symondsi Salt.
 * Strophomena walmstedti Lindst.
 * Euomphalus rugosus Sow.
 * Conularia monile Lindst.
 * Conularia sowerbyi Def.
 * Conularia sp.
 * Orthoceras angulatum Wahl.
 * Gomphoceras ellipticum ? M'Coy

The form described as Bembicosoma pomphicus is somewhat problematical and may be more nearly related to Hemiaspis than to the eurypterids. Of special interest is the finding of a scorpion in these beds. There is only one specimen of Palaeophonus loudenensis and this is in a bad state of preservation so that it is impossible to tell whether this early scorpion was aquatic and gill-bearing, or terrestrial. Drepanopterus is a new genus founded by Laurie for the three species: pentlandicus, bembicoides, and lobatus, but they are all described from imperfect material; the first from a fairly good specimen, the other two from a few slightly better. Laurie's genus Bembicosoma with the one species pomphicus was established for a few rather good fragments, which, however, were only doubtfully identified. Slimonia dubia, also described by Laurie, is but poorly represented, as are likewise the three species of Stylonurus: elegans, ornatus and