MILIOLIDA. ae 
1. Brnocunina RINGENS, Lamarck. Plate III, figs. 26—28. 
MILioLires RinGENS, Lamarck, 1804. Ann. Mus, vol. v, p. 351; vol. ix, pl. 17, fig. 1. 
Pyreo Levis, Defrance, 1824. Dict. Sc. Nat., vol. xxxii, p. 273; Atlas, pl. 88, fig. 2. 
BILOCULINA BULLOIDES, D’Ord., 1826. Ann. Sc. Nat., vol. vii, p. 297, No. 1, pl. 16, figs. 1-4 ; 
Modele No. 90. 
—_ RINGENS, Id., 1826. Ann. Se. Nat., vol. vii, p. 297, No. 2. 
_— CaNARIENSIS, Id., 1839. Foram. Canaries, p. 139, pl. 3, figs. 10-12. 
— IsaBELLEANA, Id., 1839. For. Amér. Mér., p. 66, pl. 8, figs. 17-19. 
a Peruviana, Id., 1839. Foram. Amér. Mérid., p. 68, pl. 9, figs. 1-3 (and 
sub-varieties in pl. 8). 
— suBSPH#RICA,Id.,1839. Foram. Cuba, p. 162, pl. 8, figs. 25-27. 
= BULLATA, S. Wood, 1843. Morris’s Cat. Brit. Foss., p. 61. 
_ CLYPEATA, D’Ord., 1846. For. Fos. Vien., p. 263, pl. 15, figs. 19-21. 
— sIMPLEX, Jd. 1846. Ibid., p. 264, pl. 15, figs. 25-27. 
TRILOCULINA BIPARTITA (a badly grown Biloculina), D’Orb., 1846. For. Fos. Vien., p. 275, 
pl. 17, figs. 1-3. 
BILOCULINA RINGENS, Sow., 1850. Dixon’s Foss. Sussex, p. 162, pl. 9, fig. 9, a. 
— TURGIDA, Reuss, 1851. Zeitsch. Deutsch. Geol. Ges., vol. iii, p. 85, pl. 7, fig. 55. 
_ RINGENS, Parker and Jones, 1857. Ann. Nat. Hist., ser. 2, vol. xix, p. 298, 
pl. 10, figs. 28-33. 
— — Williamson, 1858. Rec. Foram. Gt. Brit., p. 79, pl. 6, figs. 169, 170; 
Pl :Z,, 5; 171. 
— oBESA, Reuss, 1865. Sitzungsb. Akad. Wien., vol. 1, p. 450, pl. 5, fig. 7. 
Characters.—Shell, oval or sub-spherical, ultimate chamber projecting beyond the 
penultimate all round, and having its margin more or less rounded. Aperture, at the 
end of the last segment; its shape and size variable, sometimes little more than a curved 
st. Length jth to 4th inch. 
We may take this as a sub-type, comprising the numberless varieties of J/liole which 
show only two chambers externally, the ultimate and the penultimate. The form of the 
margin, the extent to which the edges of the chambers overlap, the greater or less globosity 
of the segments, and the shape of the aperture, differ m almost every specimen ; and, 
although the general appearance of the shell is much affected by these variations, they are 
of no value as characters on which to found any real specific subdivision. It is, 
however, convenient to recognise some of the most important of the modifications of the 
ordinary plan of growth, though the very fact of the inconstancy of their characters pre- 
cludes our viewing them as anything more than varieties ; of these, perhaps, Biloculina 
elongata, D’Orb.,} B. depressa, D’Orb., B. sphera, D’Orb.,? and B. contraria, D’Orb., are 
the most important. 
! Biloculina elongata, D’Orb., 1826. Aun. Sc. Nat., vol. vii, p. 298, No.4; Parker and Jones, Phil. 
Trans. 1865, p. 409, pl. 17, figs. 88, 90, 91. 
* B. sphera, D’Orb., 1839. Foram. Am. Mér., p. 66, pl. 8, figs. 13-6; Brady, 1864, Trans. Linn. 
Soc., vol. xxiv, p. 466, pl. 48, fig. 1. 
