A pictorial atlas of fossil remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology." . niferes Fossiles duBassin Tertiaire de Vienne, (Autriche). Paris, 18i6. 1 vol. 4to, with plates. FOSSIL FOEAMINrFERA. 187 violet, blue, &c. Its consistence is variable; it is composed of minute globules, the aggregationof which determines the general tint. It is sometimes entire, round, and without segments, asin Gromia, Orhulina, &c., which represent, at all ages, the embryonic state of all the other increa
A pictorial atlas of fossil remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology." . niferes Fossiles duBassin Tertiaire de Vienne, (Autriche). Paris, 18i6. 1 vol. 4to, with plates. FOSSIL FOEAMINrFERA. 187 violet, blue, &c. Its consistence is variable; it is composed of minute globules, the aggregationof which determines the general tint. It is sometimes entire, round, and without segments, asin Gromia, Orhulina, &c., which represent, at all ages, the embryonic state of all the other increase, without doubt, by the entire circumference. When the body is divided by lobesor segments, the primary lobe, as in the permanent condition of the Gromia, is at first round oroval, according to the genus; once formed it never enlarges, but is enveloped externally bytestaceous matter; it may be compared to a ball on which is applied a second larger one, then athird still larger, and so on during the life of the animal. The annexed figure of the animal oi Nummulina (as given by MM. Joly and Leymerie) willserve to convey a general idea of the living THE ANIMAL OF THE NUMMULINA. The segments, as the body increases, are agglomerated in six different ways, and these modi-fications are the basis of M. DOrbignys classification. The discoidal forms, as the Rotalia,Rosalina, Cristellaria, &c. are involuted like the nautilus, and divided by septa or partitions, thediflferent lobes of the body occupying contemporaneously every chamber, and being connected bya tube or canal that extends through the entire series. In the spiral forms, the Textilaria, & same structure is apparent. These two groups are the most abundant in the cretaceousstrata; many beds of the white chalk consist ahnost wholly of the aggregated shells of theRosalinsB, Kotalis, and TextilariEe. Whatever the form of the body, the filaments always consist ofa colourless matter as transparent as glass; they
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectpaleontology, bookyea
