Manual of Palaeontology for the Use of Students With a General Introduction On T
Manual of Palaeontology for the Use of Students With a General Introduction On T
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309 her is divided into two halves by two of the six principal septa, which are specially developed, and nearly meet along their inner edges.
Family 3. Poritida. In this extensive family the corallum is always composite, the constituent corallites being united directly or by the intervention of a more or less copious ccenenchyma. In either case the calcareous tissue of the corallum is spongy or reticulate, and the porous walls of the corallites are mostly not separable from the *v.
Fig. Ig\. Ma...drepora plantaginea, of the natural size, showing the porous ccenenchyma and the tubular corallites. Recent.
ccenenchyma, when this latter exists. The septa may be rudimen- tary or obsolete, but they are usually present, and have the form of vertical rows of spinules, which often anastomose, and give rise to a sort of trellis-work. Rarely, the septa are imperforate and lamellar. In some cases tabulae are present, and a columella may or may not be developed. The oldest types of the Poritidce appear in the Ordo- vician rocks, but the family is represented in the Palaeozoic deposits by but a few isolated genera (Protar Arczopora, Palaads, Src.
What to read after Manual of Palaeontology for the Use of Students With a General Introduction On T?
You can find similar books in the "Read Also" column, or choose other free books by Nicholson Henry Alleyne to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
309 her is divided into two halves by two of the six principal septa, which are specially developed, and nearly meet along their inner edges.
Family 3. Poritida. In this extensive family the corallum is always composite, the constituent corallites being united directly or by the intervention of a more or less copious ccenenchyma. In either case the calcareous tissue of the corallum is spongy or reticulate, and the porous walls of the corallites are mostly not separable from the *v.
Fig. Ig\. Ma...drepora plantaginea, of the natural size, showing the porous ccenenchyma and the tubular corallites. Recent.
ccenenchyma, when this latter exists. The septa may be rudimen- tary or obsolete, but they are usually present, and have the form of vertical rows of spinules, which often anastomose, and give rise to a sort of trellis-work. Rarely, the septa are imperforate and lamellar. In some cases tabulae are present, and a columella may or may not be developed. The oldest types of the Poritidce appear in the Ordo- vician rocks, but the family is represented in the Palaeozoic deposits by but a few isolated genera (Protar
What to read after Manual of Palaeontology for the Use of Students With a General Introduction On T?
You can find similar books in the "Read Also" column, or choose other free books by Nicholson Henry Alleyne to read onlineMoreLess
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