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 Palcechinus gigas, M'Coy. Eeduced. Mountain Limestone. Ireland. Productus semireticulatits, Martin, sp. (P. antiquatus, Sow.) Mountain Lime- stone. England; Eussia; the Andes, &c. Echinus. The other, Archceocidaris, represents, in like manner, the Cidaris of the present seas. Of Mollusca the Brachiopoda (or Palliobranchiates) constitute the larger part, and are not only numerous, but often of large size. Per- haps t
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 Palcechinus gigas, M'Coy. Eeduced. Mountain Limestone. Ireland. Productus semireticulatits, Martin, sp. (P. antiquatus, Sow.) Mountain Lime- stone. England; Eussia; the Andes, &c. Echinus. The other, Archceocidaris, represents, in like manner, the Cidaris of the present seas. Of Mollusca the Brachiopoda (or Palliobranchiates) constitute the larger part, and are not only numerous, but often of large size. Per- haps the most characteristic shells of the formation are large species of Productus, such as P. giganteus, P. hemisphcericus, P. semireticulatus (fig. 570), and P. scabriculus. Large plaited spirifers, as Spirifer stria- tics, S. rotundatus, and S. trigonalis (fig. 571), also abound; and smooth species, such as Spirifer glaber (fig. 572), with its numerous varieties. The family of the brachiopoda to which these shells belong, is far
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