REPORT ON .NfATERIAT.R FROM THE RORTNGR AT FUNAFUTT ATOLT.. 2.3.3 



the structure nearly obliterated. HalmivJa. The pores in the rock are lined mainly with rhombohedral 

 crystals of dolomite, but some calcite scalenohedra are present as well. 



(329, .331). Total length 202 millims., diameter 56 millims. Three cylindrical pieces of core of whitish- 

 grey, mottled, dolomitic limestone, porous, and Avith occasional cavities. Largely of casts of Mculvcpnra, 

 I'oritex, and, perhaps, some other corals as well. Corals in part hollow, but with infilled CHona borings, or 

 solidly replaced with crystalline materials, and with the usual encrusting layers of Poli/troiia plamnn and 

 LifhotJiaianion, alternating wich each other. The foraminifera include [.o49, 550] Glohignina, Aniphidcgina, 

 and Hdewdegina ; their minute structure is much altered, and scarcely recognisable. Echinid spines 

 abundant. Halimeda, imperfectly preserved. 



(332) [551]. Length 42 millims. A fragment, rounded by drill, of white, hard, porous, dolomitic limestone 

 with casts of a simple Astrsean, and of a perforate coral, which are encrusted, as usual, by Pohjtrema 

 and Lifhothamnion. The foraminifera recognisable are Glohirjerina, Amphixfrf/ina, and Hrferosfegina. 

 Echinid spines. 



(333). Length 37 millims. Cylindrical. Rock similar to preceding, with several small casts of 

 Sfi/lopora, Mach-qmm (1) and Astneopm-a, encrusted by Pohjtrema planum. Altered fragmental material 

 [552], with Gi/pdna, Amphistegina and Hrfproxfegina. Alcyonarian spicule, echinid spines, Halimeda rare. 



(334). Length 48 millims. Cylindrical. Greyish-white, hard, very porous, dolomitic rock, with 

 several casts of PocUlopnra, Seriatopora, an Astrgean, and Porifes, all unfavouralily preserved. Encrusted l)y 

 Polytrema, and occasionally by thin layers of LithoflMmnion. The foraminifera include [553] Spiroloevlina, 

 Miliolina, Glohigerina, Gi/pdna, AmpJmfegina, and Ileferoxfegina. Echinid spines, Halimeda abTuidant. 

 Pores lined by rhombohedral crystals, and the rock generally very crystalline. The structiu'e of the 

 various organisms, as a rule, much altered. 



(335). Length 88 millims. Cylindrical. Rock similar to preceding. About two-thirds of the core 

 consists of casts of corals, Porillopora and Madrepoirt, encrusted by the usual organisms [554, 555]. 

 Miliolina, AmpliiMegina, Heferostegina. Halimeda. Casts of gastropods. 



Deq)tli from Surface, 652-660 /dCif; Distance Bored, '^ feet; Total Length of Core 

 Obtained, 1 foot 9 inches; Numbers of Cores, .3.36-343. 



The cores are cylindrical, they consist of a whitish to whitish-grey, moderately 

 hard to soft, very porous, dolomitic limestone. The first core, No. 336, is very 

 similar to those immediately preceding it ; the remainder of this series contain a 

 variable amount of the usual coral casts, which, like those in the cores above, are also 

 enclosed by thick layers of Polytrema 2')lanum and Lithothamnion ; but the larger 

 part of the cores is composed of foraminifera and Halimeda-^oints, packed together 

 closely ; the interspaces between are, however, only partially occupied by crystalline 

 materials, so that the rock is very porous and light, and, in some cases, sufficiently 

 soft to be scratched by the finger nail. The corals, so far as can be judged from the 

 poorly preserved casts, comprise Oi-hicella, Fungia, Madrepora, Porites, Tiirbinaria, 

 and Ci/phastrcea. The foraminifera belong to the usual forms ; we notice the reappear- 

 ance of 07'bitolites and of Cycloclypeus, which is very abundant in the Core No. 343, 

 about 660 feet. The rhombohedral crystals of dolomite are present in this rock, 

 the same as in the preceding. Halimeda is generally distributed. Echinid spines. 

 Casts of gastropods and lamellibranchs. 



2 H 



