REPORT ON THE FORAMINIFERA. 
573 
Uvigerina, d’Orbigny. 
Polymorpha, pars, Soldani [1791]. 
Uvigerina, d’Orbigny [1826], Reuss, Czjzek, Costa, Egger, Parker and Jones, Williamson, 
Carpenter, Karrer, Brady, Alcock, M. Sars, Schwager, &c. 
Tlie ordinary external aspect of the test in the genus Uvigerina is that of a more or less 
elongated spire, haying three segments to each convolution and terminating in a tubulated 
aperture with an everted lip. The normal triserial arrangement is by no means constant, 
and some varieties are met with in which each whorl is composed of more than three 
segments, whilst on the other hand there are certain forms that exhibit a biserial or 
Textularian mode of growth. Dimorphous modifications of the typical structure, con- 
sisting of a small spiral shell surmounted by a uniserial line of segments, constitute the 
subordinate generic group, Sagrina. 
In contour, the test of U vigerina is typically ovate or slightly tapering ; occasionally 
it is trifacial, with three more or less angular longitudinal edges ; and in rare instances it 
is bifacial and compressed. The walls are calcareous, perforate, and hyaline, never 
sandy. They are seldom smooth externally, but usually bedecked with surface-ornament 
which takes the form of raised longitudinal costse, fine striae, spines, or minute prickles. 
Occasionally an intermediate condition is ‘exhibited, in which the costae are interrupted 
and part of them broken up into rows of tubercles or spines, as shown in PI. LXXIV. 
figs. 24-26. 
The genus Uvigerina is nearly related to Polymorphina, but apart from other 
distinctive characters the difference in their respective apertures is generally sufficient 
for their identification. The orifice of Polymorphmca is surrounded by radiating lines, 
whilst that of Uvigerina, whether sessile or tubulated, is furnished with a thickened rim 
or a phialine lip. 
The geographical distribution of Uvigerina extends from the most northerly points 
of the Arctic Ocean to the equator, and from the equator to the Antarctic Ice-barrier, 
and its presence has been noted at every depth down to 2600 fathoms or more. Its 
geological history, so far as is known, commences with the Eocene formations of the 
Bavarian Alps and of the vicinity of Paris, and reaches forward to the latest Glacial and 
Post-tertiary deposits of northern Europe. 
Uvigerina canariensis, d’Orbigny (PI. LXXIV. figs. 1-3). 
“Teste pineifonnes minusculae,” Soldani, 1798, Testaceograpbia, vol. li. p. 18, pi. iv. 
figs. E, F, Cr, H. 
Uvigerina nodosa, var. /?, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 269, No. 3. 
„ canariensis, Id. 1839, Foram. Canaries, p. 138, pi. i figs. 25-27. 
(ZOOL, CUALL. EXP. PART xxii. — 1884.) Y 73 
