9781230054223: Paleontology

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...Minnesota. Mus. Reg. Nos. 7636, 8021, 8043, 8058. HOMOTRYPA OALLOSA, n. sp. PLATE XX, FIGS. I5-21. Zoarium irregularly ramose, less than 80 mm. high; branches generally somewhat compressed, 6 to 12 mm. wide, 5 to 10 mm. thick. Surface with moderately distinct clusters of large cells, sometimes raised into low monticules, Zomcial apertures subangular, nearly or quite direct, enclosed by rather thick, ridge-shaped walls; thirteen or fourteen in 3 mm. Mesopores wanting. Acanthopores small, inconspicuous superficially. Internal characters: In tangential sections the most striking features are (l) the thickness and minute structure of the walls (see figs. 16 and 21) and (2) the comparative straightness of the inner edge of the cystiphragms. In the Minnesota specimens the latter seem to project a little farther across the zooecial cavity, while the walls are uniformly a little heavier and the zooecia sometimes a trifle larger than in the Kentucky form. In vertical sections the tubes bend outward gradually, and are tabulated throughout, remotely and irregularly in the axial region, where only diaphragms occur. and more crowded, also consisting chiefly of cystiphragms, in the peripheral region. On plate XX, fig. 19 shows the character of the tubes near the center of the bianch, while figs. 17 and 18 illustrate their usual appearance in the outer fourth of the diameter. In other parts of the same sections the short diaphragms crossing the Pras0pora. tubes from the series of cystiphragms to the opposite wall, are still preserved almost to the surface. That they are often wanting, as shown in the figures, is probably due to imperfect preservation. This species is clearly distinct from all the preceding. Its relations seem to be with H. curvata of...

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Geological and Natural Minnesota
Editorial: RareBooksClub
ISBN 10: 1230054227 ISBN 13: 9781230054223
Nuevos Paperback Cantidad: > 20
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BuySomeBooks
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Descripción RareBooksClub. Paperback. Estado de conservación: New. This item is printed on demand. Paperback. 264 pages. Dimensions: 9.7in. x 7.4in. x 0.6in.This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: . . . Minnesota. Mus. Reg. Nos. 7636, 8021, 8043, 8058. HOMOTRYPA OALLOSA, n. sp. PLATE XX, FIGS. I5-21. Zoarium irregularly ramose, less than 80 mm. high; branches generally somewhat compressed, 6 to 12 mm. wide, 5 to 10 mm. thick. Surface with moderately distinct clusters of large cells, sometimes raised into low monticules, Zomcial apertures subangular, nearly or quite direct, enclosed by rather thick, ridge-shaped walls; thirteen or fourteen in 3 mm. Mesopores wanting. Acanthopores small, inconspicuous superficially. Internal characters: In tangential sections the most striking features are (l) the thickness and minute structure of the walls (see figs. 16 and 21) and (2) the comparative straightness of the inner edge of the cystiphragms. In the Minnesota specimens the latter seem to project a little farther across the zooecial cavity, while the walls are uniformly a little heavier and the zooecia sometimes a trifle larger than in the Kentucky form. In vertical sections the tubes bend outward gradually, and are tabulated throughout, remotely and irregularly in the axial region, where only diaphragms occur. and more crowded, also consisting chiefly of cystiphragms, in the peripheral region. On plate XX, fig. 19 shows the character of the tubes near the center of the bianch, while figs. 17 and 18 illustrate their usual appearance in the outer fourth of the diameter. In other parts of the same sections the short diaphragms crossing the Pras0pora. tubes from the series of cystiphragms to the opposite wall, are still preserved almost to the surface. That they are often wanting, as shown in the figures, is probably due to imperfect preservation. This species is clearly distinct from all the preceding. Its relations seem to be with H. curvata of. . . This item ships from La Vergne,TN. Paperback. Nº de ref. de la librería 9781230054223

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