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 Oh. XX.] OOLITIC STKATA. 413 in their turn, repose upon the lias in the south and west of England. Among the characteristic shells of the Inferior Oolite, I may instance Terebratula fimbria (fig. 425), Rhynchonella spinosa (fig. 426), and Pholadomya fidicula (fig. 427). The extinct genus Pleurotomaria is also a form very common in this division as well as in the Oolitic sys- tem generally^ It resembles the Trochus i

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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 Oh. XX.] OOLITIC STKATA. 413 in their turn, repose upon the lias in the south and west of England. Among the characteristic shells of the Inferior Oolite, I may instance Terebratula fimbria (fig. 425), Rhynchonella spinosa (fig. 426), and Pholadomya fidicula (fig. 427). The extinct genus Pleurotomaria is also a form very common in this division as well as in the Oolitic sys- tem generally^ It resembles the Trochus in form, but is marked by a deep cleft (a, fig. 428 and 429) on one side of the mouth. The Col- ly rites ringens (fig. 430) is an Echinoderm common to the Inferior Oolite of England and France, as are the two Ammonites of which representations are here given (figs. 431, 432). Fig. 432. Fig. 433.

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