Foraminiferal Limestones. 233 



geographical area, whicli have been well investigated for their 

 microzoic fanna and are of Miocene 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 cr^'stalline, with many organic particles 

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

 ■exception of the more gigantic forms as Orhitoides and Carpenteria, 

 which are yellowish brown. 



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

 ■echinoderm spines, foraminifera, and Lithothamnion. 



The foraminifera are as follows : — 



SpirolocuUna, 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. 

 <isperula, Karrer,^ or Sp. nifMa, d'Orbigny^; but, owing to the 

 obscuration of the specimens by the surrounding material, it is 

 ■difficult to sa}^ whether the test is finely arenaceous or not. 



Miliolina trigonula (Lamarck). 



Miliolites triffonula, Lamarck, 1804, Ann. du Mus, vol. v, p. 351, No. 3 ; 



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

 Miliolina trigonula (Lara.), Brady, 1884, Rep. Chall., vol. ix, p. 164, pi. iii, 



figs. 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 suhrotu?ida (Montagu). 



Vermiculum subroticndum, Montagu, 1803, Test. Brit., pt. ii, p. .')21. 

 Miliolina subrotunda (Montagu), Brady, 1884, Rep. 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, 257. 



2 Sitzungsb. k. Ak. Wiss. Wien, vol. Ivii, 1863, p. 136, pi. i, fig. 10. 



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



