DESCRIPTION OF A LIMESTONE OF LOWER MIOCENE AGE. 291 
Rotalia calear, d’Orb. sp., Brady, 1884, Rep. Chall., Vol. 
Ix, p. 709, pl. cviii, fig. 3. Chapman, 1910, Proc. Roy. 
Soc. Vict., Vol. xxi1 (N.S.), pt. ii, p. 289, pl. iii, fig. 2. 
This is a typical coral-reef species at the present day. 
As a fossil it occurs in the older Muddy Creek beds (Oligo- 
cene); and in the Batesford limestone series (Miocene). 
One or two specimens with the salient features well- 
defined, occur in the limestone. They show the strong 
papille and vestiges of the spurs of secondary shell-growth 
_ of this species. 
Fam. Nummulinide. 
Genus AMPHISTEGINA, d’Orbigny. 
AMPHISTEGINA LESSONII, d’Orbigny. Plate VII, fig. 2; 
Plate IX, fig. 8. 
Amphistegina lessonii, d’Orbigny, 1826, Ann. Sci. Nat., 
Vol. vil, p. 304, No. 3, pl. xvii, figs. 1—4; Modele, No. 
98. Brady, 1884, Rep. Chall. Vol. 1x, p. 740, pl. exi, 
figs. 1-7. Flint, 1899, Rep. U.S. Nat. Mus. (Rep. for 
1897), p. 338, pl. Ixxx, fig. 4. 
The lenticular testsof the above species are very abundant 
in portions of the Papuan limestone. The majority of the 
shells are of the thick, inzequilateral type, typical of the 
warmer areas of the coral seas at moderately shallow 
depths. The post-Miocene limestone of Port Stanley, New 
Hebrides, contains similar varietal forms with thickened — 
tests, associated with the encrusting Polytrema planum, 
Carter.* 
Genus OPERCULINA, d’Orbigny. 
OPERCULINA COMPLANATA, Defrance sp. Plate VII, fig. 2. 
Lenticulites complanata, Defrance, 1822, Dict. Sci. Nat., 
Vol. xxv, p. 453. 
1 As at Funafuti and elsewhere, see Chapman, Journ. Linn. Soc. Lond., 
Zool., Vol. xviit, 1901, p. 205. 
