Foramimferal Limestones. 231 



At the actual contact of the basalt with the limestone bed 

 just described, the rock is composed of comminuted limestone 

 intermingled with granules of glassy basalt or palagonite (specimen 

 No. 3). In the limestone fragments of this rock foraminifera, 

 such as Uetcrostegina, can still be distinguished, but they are much 

 altered by the action of heat from the basalt. 



The rock (No. 522) above the first basalt sheet is a yellowish 

 limestone, not quite so dark as jN"©. 2, and, as far as can be seen, 

 is devoid of Orbitoides. The foraminifera are as a whole somewhat 

 different from that of the preceding limestone (No. 2). Besides 

 foraminifera, which are here numerous, there are remains of 

 polyzoa, echinoderm spines, Lithothanmion, and other calcareous 

 algae. The rock is granular or hemicrystalline, whilst here and 

 there it shows traces of travertine structure possibly due to the 

 deposition of carbonate of lime from the flow of warm or heated 

 currents of water. 



The foraminifera ol)served in sections of this limestone (522) are 

 as follows : — 



? Troehammina, sp. 



Textularia rtigosa (Reuss). 



Plecaniuni ritgosiim, Reuss, 1869, Sitzungsb. k. Ak. "Wiss. Wien, vol. lix, p. 453, 

 pi. i, figs. 3«, b. 



The specimen in our section shows the irregular contour, similar 

 to that of the above-mentioned species. It is usually found 

 associated with coral reefs. 



Bolivina heyricM, Reuss. 

 Bolivina pygmcea, Brady. Rare. 

 ? Sphceroidina. Spherical segments. 

 ? Fullenia, si^. Very rare. 



Truncatulina lohatula (Walker & Jacob). 



As in the former rock- specimen, this species is fairly common in 

 the sections. A few of the examples are higher in the vertical 

 line, and therefore more nearly resembling T. refulgens (Montfort). 



Pulvinulina repanda (F. & M.). 

 One or two examples of this species are present also in this rock. 

 Gypsina globulus (Reuss). Several fine specimens. 



