REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 221 



limestone, containing numerous casts of Madrepora, PociUopora, and Ser'iatopora, 



with encrusting Pohitrema planum and Lithothamnion. There is much fine organic 



sediment Avith foraminifera, cemented by calcite. Echinid spines. Halimeda, casts 



of gastropods. 



Details. 



(223). From 450 to 453 feet. Length 31 millims. An iri-egular lump, worn hy drill, of white, porous 

 and cavernous, calcareous rock, with casts of Forillopora, Carpcnteriu, Aiiqihi^itrgiiia, and Cheilostomatous 

 polyzoa. 



(224, 225). Two pieces of cylindrical core with a total length of 87 millims. Rock porous and cavernous 

 where corals have heen dissolved out. Casts of MiUrpora {f), Scriainpora, and Mndrfpnra. Infilled Cliona 

 boring. 



(226). Length 75 millims. Cjdindrical core of whitish, porous and cavernous rock with casts of 

 Sermtoponi. and branching Maihrpom. A microscopic section [656] shows that the corals are inclosed in 

 fine sediment mth fragments of Fohifri'im, Glohigerina, casts of gastropods and echinid spines, and cemented 

 together by calcite. 



(227, 228). Two cylindrical cores with a total length of 145 millims. Rock hard, white, and cavernous, 

 like preceding. Numerous casts of PnrillojKira and Madrepora, encrusted by Lithothamnion. Casts of 

 gastropods. Cliona borings. 



(229). Length 75 millims. Cylindrical core of hard whitish rock [533, 534], with cast of Madrepora and 

 a considerable amount of encrusting Pohjtrema planum and Lithothamnion. The larger part of the rock 

 consists of fine calcareous sediment with Orhifolifes, TcxtiiJaria, Carpentcria, echinid spines, Halimeda, and 

 numerous other fragments of indeterminable organisms, cemented by calcite into a hard rock. 



Sample of loose fragments of white rock, broken up by the drill. A microscopic section [846] of some 

 of the rock chips, the largest of which was 1'7 millims. across, showed the following foraminifera, deter- 

 mined by Mr. Chapman; Xonionina{1) Carpenteria, PuJijtrfrna rniniareum, Calcarimi, and Ampldstcgina. 



From 453 to 457 feet. Sample of angular chips of whitish rock, broken up by the drill. Very littl 

 distinguishable under a lens beyond an occasional specimen of A mphistegina. 



Depth from Surface, 457-468 feet; Distance Bored, IL feet; Total Length of Core 

 Obtained, 7 inches; Numbers of Cores, 230-233. 



From this 1 1 feet of the boring only four pieces of solid core were secured. These 

 fragments are of a whitish and greyish-white, porous limestone, in which under a 

 lens very little structure can be seen ; thin microscopic sections show that it is 

 composed of very fine sediment containing minute detrital, mostly unrecognisable, 

 fragments of foraminifera. There are some obscure indications of corals, but too 

 indefinite for determination. 



Details. 



(230). From 457 to 468 feet. Diameter 40 millims. A lump of whitish fairly compact rock, rounded 

 by drill. A microscopic section [657] shows that it is a consolidated calcareous mud with fragments of 

 Carpenteria, Amphistegina, and Rdcrodegina. Only a single entire specimen of Ainplmteginxo present in the 

 slide. 



(231). Length 35 millims. A rounded piece of white rock ai)parently similar to the preceding. 



(232). Diameter about 50 millims. A fragment of white porous rock, rounded by drill. The only 

 objects distinguishable under a lens are obscure casts of corals and gastropoda. 



(233). Length 45 millims., diameter 55 millims. Cylindrical core of the same white porous rock as the 



