Catalog - Pulvinulina gilberti

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Pulvinulina gilberti

Citation: Pulvinulina gilberti Bagg 1908

Type specimens: Plate V, figs. 11-15 Cat. No. 8191. U.S.N.M., Station II. 4555.

Type repository: Washington, USNM

From the dredging of Station 4567 I find two specimens of Pulvinulina which appear to be new. The test is highly vaulted upon the inferior side, withdeeply sunken septa which extend from the margin to the umbilicus in an almost straight line, as in Pulvinulina canariensis d'Orbigny, which this species somewhat resembles. The segments are, however, more compactly built and the aperture a neatly shaped arch, lies midway between the periphery and the umbilicus upon the inferior surface. The superior surface, instead of being vaulted as in P. canariensls, is almost complanate and the periphery is almost keeled, being quite sharp and distinct, although somewhat lobulated on the last two chambers of the ultimate whorl. There are five segments visible in the last convolution and they are equally distinct upon both surfaces. (See Plate V, figs. 11-15.)

The shell is very minute and firmly built. It has a slight resembblance to Tentaculina dutemplei (d'Orbigny), but the margin is sharp and more angular in the present form, and the septal lines upon the inferior surface are much more depressed and the chambers more inflated. It is somewhat doubtful whether the present form should be considered a distinct species or only a variety of Pulvinulina menardii, which it resembles. It is much smaller than P. menardii, much more vaulted upon the inferior surface, and a little more closely involute. The septal depressions also are strong, deeply sunken on the lower side, and extend straight to the center. Upon the superior side they are strongly curved as in P. menardii. There are five of these chambers in the final convolution. The ultimate chamber is largest and in its outline reminds one of the auriculate type of Pulvinulina, but it is not so extended from the whorl. It is not a young form of P. menardii. Present and rather common at Station H. 4555. T

Named for Professor Charles H. Gilbert, of Stanford University, California.

References:

Bagg, R. M. (1908). Foraminifera collected near the Hawaiian islands by the steamer Albatross in 1902. Proceedings of the United States National Museum. 34(1603): 113-172. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Pulvinulina gilberti Bagg 1908

Pulvinulina gilberti

References:

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