. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXT.] fossils of the mountain limestone. 515 modern or Neozoic type, if, by the latter term, we designate (as pro- posed by Prof. E. Forbes) all strata from the triassic to the most mod- ern, inclusive. The accompanying diagrams (figs. 563, 564) may Fig. 563. Palaozoic type of lamelliferous cup-shaped Coral. Order Zoaxtilaeia bugosa, Milne Ed- wards and Jules Hainie. a. Vertical section of Campophyllum flexuosum (Oya- thophyllum, Goldfuss); £ nat. size: from the
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXT.] fossils of the mountain limestone. 515 modern or Neozoic type, if, by the latter term, we designate (as pro- posed by Prof. E. Forbes) all strata from the triassic to the most mod- ern, inclusive. The accompanying diagrams (figs. 563, 564) may Fig. 563. Palaozoic type of lamelliferous cup-shaped Coral. Order Zoaxtilaeia bugosa, Milne Ed- wards and Jules Hainie. a. Vertical section of Campophyllum flexuosum (Oya- thophyllum, Goldfuss); £ nat. size: from the Devo- nian of the Eitel. The lamella are seen around the ioside of the cup; the walls consist of cellular tis- sue; and large transverse plates, called tabula, di- vide the interior into chambers. >. Arrangement of the lamella' in. Polycelia profunda. Germar, sp.; nat size: from the Magnesian Lime- stone, Durham. This diagram shows the quadripar- tite arrangement of the lamellae characteristic of palteozoie corals, there being i principal and S inter- mediate lamella?, the whole number in this type being always a multiple of 4 s. Stauria astraformis, Milne Edwards. Young group, nat. size. Upper Silurian, Gothland. The lamella in eaeh cup are divided by i prominent ridges into 4 Fig. 5&i. Neozoic type of lamelliferous cup-shaped Coral. Order Zoaxthaeia apobosa, M Edwards and J. Haime. a. Parasmilia centralis, Mantell, sp. Vertical section, nat size. Upper chalk, Gravesend. In this type the lamella are massive, and extend to the axis of loose cellular tissue, without any transverse plates like those in fig. 563 a. '?. Cyalhina Boicerbankii. Edwards and Haime. Transverse section, enlarged. Gault, Folkestone. Lu this coral the lamella are a multiple of six. The twelve principal plates reach the central axis or columella, and between each pah- there are three secondary plates, in all forty-eight. The short intermediate plates which proceed from the columella are not
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
