564 
THE VOYAGE OE H.M.S. CHALLENGER. 
Polymorphina lanceolata., Reuss (PI. LXXII. figs. 5, 6). 
Polymorphina lanceolata, Reuss, 1851, Zeitschr.. d. deutsch. geol. Gesellsch., vol. iii. p. 83, pi. vi, 
fig. 50. 
Outtulina cylindrica, Bornemann, 1855, Ibid. vol. vii. p. 347, pi. xyiii. figs. 4-6. 
Polymorphina praelonga, Egger, 1857, Neues Jahrb. fiir Min., &c., p. 287, pi. xiii. figs. 25-27. 
„ subteres, Reuss, 1860, Sitzungsb. d. k. Akad. Wiss. Wien, vol. xlii. p. 361, pi. ii. 
fig. 14. 
,, lanceolata (pars), Id., 1870, Ibid. vol. lxii. p. 487, No. 12; — 
Schlicbt, 1870, Eoram. Pietzpubl, pi. xxxi. figs. 5, 6, &c. 
„ fusiformis (pars), Brady, Parker, and Jones, 1870, Trans. Linn. Soc. Lond., 
vol. xxvii. p. 219, pi. xxxix. fig. 5, b.c. 
In the memoir on the Polymorphince already referred to, the elongated forms con- 
stituting the Polymorphina lanceolata of Reuss, together with the more oval varieties 
last described, were included with certain similar but shorter tapering modifications in 
one common group, of which the Polymorphina fusiformis of Roemer was adopted 
as the type. Reuss’s notes on the comprehensive series of figures of Polymorphina 
in von Schlicht’s illustrations of Tertiary Foraminifera supply a favourable basis for 
the reconsideration of many points in connection with the specific grouping of the 
genus, and they appear to warrant the retention of Polymorphina lanceolata as a 
distinctive term in the sense in which it was originally employed. 
In its typical condition the test of this species is elongate and cylindrical or some- 
what compressed, and it tapers to a point at the inferior extremity ; it seldom has more 
than six segments, and the sutures are little, if at all, excavated externally ; the apertural 
end is tapering and bluntly pointed. The aperture is commonly radiate, but in exceptional 
cases it takes the form of a simple rounded orifice in a short, produced neck, and in rare 
examples it is furnished with an entosolenian tube. 
Polymorphina lanceolata represents a starved condition of the genus, and like the 
foregoing closely allied species, it has a wide area of distribution. Its maximum depth 
appears to be about 1825 fathoms. 
If one may judge from M. Terquem’s drawings (Foram. du Lias, 4 ifeme Mem., 
pis. xi.-xiv.), some of the Liassic Polymorphince may very properly be assigned to the 
present species ; but setting aside the somewhat ill-defined Mesozoic forms, its ascertained 
geological range is limited to the middle and later Tertiary formations of Central Europe. 
Polymorphina ovctta, d’Orbigny (PI. LXXII. figs. 7, 8). 
Polymorphina ovata, d’Orbigny, 1846, For. Foss. Vien., p. 233, pi. xiii. figs. 1-3. 
,, „ Reuss, 1867, Sitzungsb. d. k. Akad. Wiss. Wien, vol. Iv. p. 91. 
The test of this species has an oval but somewhat inequilateral outline, and the two 
faces are almost equally convex ; the oral end is obtuse, the aboral acuminate ; the segments 
