Foraminifeml Limestones. 23^^ 



geographical area, which have been well investigated for their 

 niicrozoic fauna 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 exhi])it 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 

 (exception of the more gigantic forms as Orhitoides and Carpentena, 

 which are yellowish brown. 



The organisms present in limestone Xo. 924 consist of polyzoa, 

 ■echinoderm spines, foraminifera, and Lithothamnion. 



The foraminifera are as follows : — 



Sj)ifoloculi}ia, sp. 



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

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

 asperula, Kan-er,- or Sp. nitida, d'Orbigny •' ; but, owing to the 

 obscuration of the specimens b}- the surrounding material, it is 

 <lifficult to say whether the test is finely arenaceous or not. 



Miltolina trigonula (Lamarck). 



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



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

 MUioUna trigonula, (Lam.), 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 suhrotunda (Montagu). 



Vermiculum subrotnndum, Montagu, 1803, Test. Brit., pt. ii, p. o21. 

 Miliolina suhrotunda (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. 256, 257. 



2 Sitzungsb. k. Ak. Wiss. Wien, vol. Ivii, 1868, p. 136, pi. i, fig. 10. 



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



