On the nomenclature of the Foraminifera. Pt. III. The species enumerated by Von Fichtel and Von Moll / by W.K. Parker and T.R. Jones.

  • Parker, William Kitchen, 1823-1890.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: On the nomenclature of the Foraminifera. Pt. III. The species enumerated by Von Fichtel and Von Moll / by W.K. Parker and T.R. Jones. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    better than the trochiform varieties, some of which become, as it were, isomorphs of Rotalia proper, others of Nonionina. 29. Nautilus tuberosus. PageJll, pi. 20. fiffs. q-k. “ Fossil • Coroncina.^^ i o y This is a variety of Planorbulina farcta, with many chambers irregularly set on, and mostly narrow. This PL tuberosa has the biconvex form which chiefly characterizes D’Orbigny’s Ano- malina, and is intermediate to his A. Badenensis and A. Amtriaca. This tuberose variety may be said either to represent an early stage of Planorbulina vulgaris, or to be a neatly growing and nearly symmetrical modification of Truncatulina variabilis. Like P. farcta, this variety is very common in the Mediterranean and other warm seas, and occurs in Tertiary deposits. 30. Nautilus planatus. Page 91. Three varieties. “Recent: Leghorn coast, Tuscany.’^ Var. a. PI. 16. figs, a-c {i, section). “Schroter, Neue Literat. d. Naturgesch. vol. i. p. 314, pi. 1. fig. 7.” Var. /S. PI. 16. figs. d-f. Var. 7. PI. 16. figs, g, h. This is “ le Penerople aumusse (the Peneroplis planatus) of Denys de Montfort, and is a distinctly specific type of one of the opake-shelled Foraminifers. Commencing with a primordial double chamber, like that of the Miliola, Orbiculina, and Orbito- lites, it soon takes on a Nautiloid growth; the aperture, at first single, margined, and irregular, soon becomes more irregularly trilobate in the successively enlarging triangular septal faces (as in Dendritina, where it is arborescent); in a further stage of the shell, the newer chambers are flat, narrow, and transversely long, spreading out with widening curve,—keeping a Nautiloid outline, as in var. a; becoming auricular or bonnet-shaped, as in var. j8; or showing some modifications of the above, arising fi’om an irregular periodicity of growth, as in var. 7. In other forms, the shell grows on until the newest chambers extend in their curvature far back, even to three-foux’ths of a circle, as if they would take on a cyclical growth, such as is normal in Orbiculina and Orbitolites. In the b^road, complanate, typical varieties, the septal face is necessarily very long and narrow, and is perforated by one or more rows of roundish or hourglass-shaped, thickly margined passages, subtubular and more or less ecto-ento-sole- nian. This condition is attained by the p-adual lineation and subdivision of the lobulate and dendi’itine aperture. These broad forms are fi’om the seaweed-belt of the warmer seas; but in somewhat deeper water they are gradually replaced by smaller and contracted varieties, in which the spiral portion is small and nautiloid, followed by a long series of either compressed or cylin- drical joint-like cells, presenting altogether an elegant crozier-