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The brachiopoda of the Llandeilo flags, which number 47 species, are in the main the same as those of the Caradoc Sandstone, but the other mollusca are in great part of different species. Orthoceras duplex, Wahlenberg. Russia and Sweden. Asaphus tyrannus, Murchison. Ogygia Buchii, Burm. Syn. Asaphus Buchii, Brongn.
The names of these, given by the classical Linnaeus and Wahlenberg, tell in some cases of their birth-places, in others of their hardihood, their lurid colours and weather-beaten aspects; such as tristis, gelida, glacialis, arctica, alpina, saxatilis, polaris, frigida, and numerous others equally familiar to the Scotch botanist.
The same species has sometimes continued to exist under slightly modified forms throughout the whole of the Ordovician and Silurian as well as the entire Devonian and Carboniferous periods, as in the case of the shell generally known as Leptaena rhomboidalis, Wahlenberg. No less than fifteen commonly received species are demonstrated by Mr.
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