12 FORAMINIFERA OF THE CRAG. 



5. Qdinqueloculina Ferussacii, D' Orhi(/ny. Plate IV, fig. 4. 



QciKQUELOCULiNA Ferussacii, B'Orb., 1826. Modele No. 32 ; Ann. Sc. Nat., vol. vii, 

 p. 301, No. 18. 



— Berthelotiana, Id., 1839. Foram. Canaries, p. 142, pi. 3, figs. 25—27. 



— iNyEQUAUS, Id., 1839. Ibid., p. 142, pi. 3, figs. 28—30. 



— BicosTATA, Jrf., 1840. Foram. Cuba, p. 194, pi. 12, figs. 8— 10. 



— POLYGONA, Id., 1840. Ibid., p. 198, pi. 12, figs. 21—23. 



— TRICAEINATA, 7rf., 1840. Ibid., p. 187, pi. 11, figs. 7— 9. 



— CONCAVA, Revss, 1850. Denks. Akad. Wien., vol. i, pi. 51, fig. 2. 

 MiLiOLiNA BicORNis, var. AKGULATA, Williamson, 1858. Rec. For. Gt. Brit., p. 88, pi. 2, 



fig. 196. 

 MiLioLA (Quinqueloculina) Ferussacii, Parker and Jones, 1865. Phil. Trans,, vol. civ, 



p. 411, pi. 15, fig. 36. 



Characters. — Chambers arranged as in the other Quinquehculinee. Surface of the 

 shell traversed by a few coarse longitudmal ridges. Colour, white to dirty white, or 

 yellowish. Length, ,gth 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 Miliola, 

 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 tiie 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 Qimiqueloculina hicosiafa and Q. poli/ffona,hoi\i 

 of which have almost exactly the characters of the " Model," and in Q. tricarinata we 

 have wliat 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. flewuosa (p. 73, pi. 4, figs. 4 — 6), 

 has the striae running in an oblique direction; in the other, Q. Inca (p. 75, pi. 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 SpiroloculincE, such as Sp. ci/mhium (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 



