Conularia ornata, D'Arch. and De Vern. (Geological Transactions
Sec. Ser. volume 6. Plate 29.) Refrath, near Cologne.)
(FIGURE 519. Bronteus flabellifer, Goldf. Mid. Devon; S. Devon; and the Eifel.)
Among the peculiar lamellibranchiate bivalves common to the Plymouth limestone
of Devonshire and the Continent, we find the Megalodon (Figure 517). There are
also twelve genera of Gasteropods which have yielded 36 species, four of which
pass to the Carboniferous group, namely Macrocheilus, Acroculia, Euomphalus, and
Murchisonia. Pteropods occur, such as Conularia (Figure 518), and Cephalopods,
such as Cyrtoceras, Gyroceras, Orthoceras, and others, nearly all of genera
distinct from those prevailing in the Upper Devonian Limestone, or Clymenien-
kalk of the Germans already mentioned. Although but few species of Trilobites
occur, the characteristic Bronteus flabellifer (Figure 519) is far from rare,
and all collectors are familiar with its fan-like tail. In this same group,
called, as before stated, the Stringocephalus, or Eifel Limestone, in Germany,
several fish remains have been detected, and among others the remarkable genus
Coccosteus, covered with its tuberculated bony armour; and these ichthyolites
serve, as Sir R.
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