REPORT ON i\rATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 225 



(261). Length 58 milliras. Core cylindrical, very cavernous and porous, casts of I'l/rillojiom and 

 Madnpora mnteda. Infilled Cliuna borings, very iiunierous in the coral cavities. Carji/mieriu, Litho- 

 ihamnwn. 



(262). Length 35 millims. Core cylindrical, whitish rock similar to preceding, M'ith casts of PncillojH/ra 

 and Madrcpora. 



(263). Length 20 millims. A rounded j^iece of greyish-white, porous limestone. Some casts of 

 undeterminable corals ; the larger part of the rock is seen under the microscope [664] to consist of 

 organic fragments, with Carpcnfi'viu, Pdhjtrfiiiu j/iiniarcinii, P. jjhmtun, Gjip^ina ccdndarls, var. discus, 

 AmpMsfegina, Hiderodegina, alcyonariari spicules, eehinid spines, and lamellibranchiate shells. Litho- 

 thamnion and Haliincda are rare. 



(264). Length 50 millims. Cylindrical core of white, very porous limestone ; casts of corals, 

 A/npJiist('i/iiiu, and Llfhotha/iiniun. 



(265). Length 45 millims. Irregular piece of white rock ; cast oi Madrepm-a. Rock mainly fragmental, 

 with A m])lmtegina. 



(266). Length 66 millims. Cylindrical core, hard, compact where Liihothamnion occurs. Casts of 

 Pocillopora and Madrepora. Infilled C'liana borings. 



(267) [535]. Length 60 millims. Cylindrical core of greyish-white, hard, compact limestone, with some 

 cavities where Pocillopom, S/'viafopora, and gastropod shells have been removed. Encrusting Litliothainnion 

 verj' abundant. Consolidated fragmental materials, with TriincatiiUnu, Carpenteriu, Poh/trema ininiaceurn, 

 P. planum, Gypsina vem-ukms, var. dixnts, Calnninu, and Aiuphistfgina. Alcyonarian spicules. Clwna 

 Ijorings. Cemented by calcite. 



Samj^le of loose fragments, broken up by drill. Coarse and fine angular and l^lunted chips of white rock 

 with fragments of coral casts, including Podllopm-a. Amphistcgina. Alcyonarian spicules, polyzoa, rare. 



Depth from Surface, 526-546 feet; Distance Bored, 20 feet; Total Length of Core 

 Obtained, 4 feet; Numhers of Cores, 268-289. 



The solid cores, for the most part cylindrical, are of white and greyish-white, hard 



limestone, generally cavernous, due to the removal of corals ; in places porous, and 



not infrequently compact where Lithothamnion occurs. The corals belong to 



Pocillopora, which is very abundant, occasional Astrsean corals, very imperfectly 



shown, Prionastrcea (?), Coeloria. A fungid coral, Halomitra (?) and Madrepora, 



which is not so frequent in these cores as in the preceding. Alcyonarian spicules. 



Lithothamnion is abundant and forms an important constituent of the rock. There 



is a considerable amount of fragmental materials with foraminifera. Polytrema 



planum, occurs as encrusting layers alternating with Lithothamnion. The coral 



structures and the gastropod shells in some of these cores are now replaced by 



crystalline calcite. 



Details. 



(268). Length 23 millims. An irregular fragment of white limestone with casts of Madrcqwra. 



(269). Length 75 millims., diameter 55 millims. Core cylindrical, of white, hard, mostly compact rock 

 [665] with some casts of PocilIq)ora and Madrepora. A piece of a compound Astrsean, showing casts of 

 three or four calices. The greater part of the core consists of consolidated fine calcareous sediment with 

 organic fragments and foraminifera, including Carj)enteria, Polytrema rniniaceum, P. plamm, Gyp)sina 

 vesicularis, var. discus, common, and AmpMstegina. Alcyonarian spicules, and eehinid spines. Lithothamnion 

 in white, nodular fragments and also encrusting. 



2 G 



