12 FORAMINIFERA OF THE CRAG. 
3d. QuINQuELOCULINA Frrussact, D’Orbigny. Plate IV, fig. 4. 
QUINQUELOCULINA Frrussactt, D’Ord., 1826. Modéle No. 32; Ann. Sc. Nat., vol. vii, 
p. 301, No. 18. 
oe BERTHELOTIANA, Id., 1839. Foram. Canaries, p. 142, pl. 3, figs. 25—27. 
— INEQUALIS, Id., 1839. Ibid., p. 142, pl. 3, figs. 28—30. 
= BICOSTATA, Id., 1840. Foram. Cuba, p. 194, pl. 12, figs. 8—10. 
= POLYGONA, Id., 1840. Ibid., p. 198, pl. 12, figs. 21—23. 
— TRICARINATA, Id., 1840. Ibid., p. 187, pl. 11, figs. 7—9. 
— concava, Reuss, 1850. Denks. Akad. Wien., vol. i, pl. 51, fig. 2. 
MILIOLINA BICORNIS, var. ANGULATA, Williamson, 1858. Ree. For. Gt. Brit., p. 88, pl. 2, 
fig. 196. 
MILIOLA (QUINQUELOCULINA) Frrussacti, Parker and Jones, 1865. Phil. Trans., vol. clv, 
p. 411, pl. 15, fig. 36. 
Characters.—Chambers arranged as in the other Quingueloculine. Surface of the 
shell traversed by a few coarse longitudinal ridges. Colour, white to dirty white, or 
yellowish. Length, th inch. 
The assemblage of forms which we associate under the general name Q. Ferussacii 
comprises specimens varying greatly, not only in the extent of the development and over- 
lapping of the segments, and consequently in shape, but also in the amount and nature 
of the surface-ornamentation. D’Orbigny’s Modele No. 32, is a thick elongated M/iliola, 
with a very few stout longitudinal ridges at irregular intervals, and at first sight will be 
thought a very different form from that which we figure. We shall therefore enumerate a 
few of the more important varieties which have been named by other observers, in order 
to show the great range of variation which exists amongst members of the group. In 
D’Orbigny’s ‘Cuba’ Monograph we find Quinqueloculina bicostata and Q. polygona, both 
of which have almost exactly the characters of the “Model,” and in Q. éricarinata we 
have what is evidently an anomalous specimen of the same variety, differing from the 
others chiefly in the confused setting-on of the ribs, which are partly in longitudinal lines, 
and partly reticulated or looped. In his South-American work there are interesting 
figures of two sub-varietal forms, both of which possess an ornamentation of fine striae, 
in addition to the main angular ridges; one of these, Q. flexuosa (p. 73, pl. 4, figs. 4—6), 
has the striz running in an oblique direction; in the other, Q. Juca (p. 75, pl. 4, figs. 
20—22), they are parallel with the ridges. Some other slightly differentiated forms, 
tending in the direction of the Spiroloculine series, have been figured ; and, were we to 
take certain of the so-called Spiroloculine, such as Sp. cymbium (D’Orb.), we should find 
it impossible to describe them by any zoological term which would not apply equally well 
to many specimens of the form now under consideration ; indeed, the inosculation is so 
complete, as to render any specific (not to say generic) distinction impracticable, however 
necessary it may be for the sake of convenience to recognise the artificial division of the 
family. The single specimen (Plate IV, fig. 4) from the Crag is one of the out-spread 
