Foramiiu feral Limestones. 233 



geographical area, which have been -well investigated for their 

 microzoic fauna and are of Pliocene age.' 



The first of the Miocene Orbitoidal Limestones is specimen 

 No. 924, which was taken in contact with the basalt bed above 

 referred to, and to the south of Flying Fish Cove at Smith Point. 

 Thin slices of this rock exhibit layers of travertine, differing from 

 the previous occurrence in being evenly stratified and not filling 

 up angular cavities. This was probably formed by deposition from 

 warm currents flowing over an evenly laid, sandy sea- bottom. 

 The rock itself is roughly crystalline, with many organic particles 

 interspersed ; these latter are of an ash-grey colour, with the 

 (;xception of the more gigantic forms as Orhitoides and Carpenteria, 

 which are yellowish brown. 



The organisms present in limestone jS^o. 924 consist of polyzoa, 

 cchinoderm spines, foi'aminifera, and Lithothamnion. 



The foratninifera are as follows : — 



Spi'roloculina, sp. 



In the more finely grained material of this rock there are one 

 ■or two examples of a small Spiroloculina, of the type of Sp. 

 asperula, Karrer,- or Sp. nitida, d'Orbigny ^ ; but, owing to the 

 obscui'ation of the specimens by the surrounding material, it is 

 difficult to say whether the test is finely arenaceous or not. 



Miliolina trigonula (Lamarck). 



Miliolitcs trigonula, Lamarck, 1804, Ann. du Mus, vol. v, p. 351, No. 3 ; 



1822, Auim. sans Vert., vol. vii, p. 612, No. 3. 

 Miliolina trigonula (Lam.), Brady, 1884, Eep. Chall., vol. ix, p. 164, pi. iii, 



iigs. 14-16. 



Several specimens occur in No. 924. It is a well-known 

 Tertiary form ; and in recent deposits is at home in depths down 

 to 100 fathoms. 



Miliolina stibrotunda (Montagu). 



VnrmicitUtm suhrotiindHin, Montag-ii, 1803, Test. Brit., pt. ii, p. .521. 

 Miliolina subrotunda (Montagu), Brady, 1884, Itep. Chall., vol. ix, p. 168, pi. v, 

 figs. 10, 11. 



This species is well seen in the sections and distinguished by 

 its subcircular contour. It has occurred in other Miocene deposits, 

 and is frequent as an inhabitant of moderately shallow water 



' See Verbeek & Fennema, " Descr. geol. Java et Madoura," Appendix, vol. ii, 

 1896. Also Newton & Holland, Ann. Mag. Nat. Hist., ser. vii, vol. iii, 

 pp. 2.56, 2.57. 



'^ Sitzuugsb. k. Ak. "Wiss. AVien, vol. Ivii, 1868, p. 13B, pi. i, fig. 10. 



3 Ann. Sci. Nat., vol. vii, 1826, p. 298, No. 4. 



