EEPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 227 



organisms are cemented by calcite into hard rock. Of the foraminifera, Carpcnteria 

 is abundant, and Polytrema planutii. Alcyonarian spicules, echinid spines. Very 

 little can be seen of the character of tlie rock except in the microscopic sections. 



Details. 



(290, 291). Two fragments of hard white limestone, with a total length of 40 miliims. Only layers of 

 Litliothamnion can be seen with lens. 



(292). Length 45 miliims. Cylindrical core, of whitish limestone, with cavities from which corals may 

 have been removed. Rock principally of encrnsting layers of Lifhofliamnion, with consolidated fragmental 

 materials. 



(29.3). Length 75 miliims. Core cylindrical, of whitish-grey hard limestone, cavernous, like the 

 preceding. Adnm (1) and perforate coi'al. Larger part of core of undulating layers of Lithothauvniov. and 

 fragmental material. 



(294). Length 50 miliims. Core cylindrical, of whitish hard rock, with cavities and small hollows. 

 Microscopic sections [536, 668] show that the rock mainly consists of l)ranching Lifhofhamnion, encrusted 

 in places by Poh/trema jjlanum. Fragmental materials, mostly of foraminiferal dehrU, fill up the inter- 

 spaces ; consolidated with these in the fine sediment are the following foraminifera : — Cymbalopoi'a, 

 Orbifolif/'s, Carpcnteria, PlanorhiiUna, PoJytrrma iiiiniac/'iitn; Gypsina discus, and Calcarina. Alcyonarian 

 spicules, echinid spines. 



(295). Length 25 miliims. Core cylindrical; rock similar to preceding, cast of large gastropod. 



(296). Length 130 miliims. Core cylindrical; hard greyish-white rock, with large vertical hollow 

 cavities. A microscopic section [669] shows the rock to be filled with Caipenteria and Polytrema miniaceum, 

 together with layers of Lithofhamnion. OrlntoUtes, Planorhulina, Gypsina discus, and Amplmtegina are also 

 present in the fine calcareous sediment, which is cemented by calcite. Some of the hollows are lined with 

 scalenohedral crystals. 



Depth from Surface, 555-567 feet ; Distance Bored, 12 feet; Total Length of Core 



Obtained, 0. 



No solid cores were obtained from the 12 feet of the boring ; the only materials 

 brought to the surface being the pounded angular and rounded fragments of rock 

 raised by the sand-pump. These are of hard, whitish rock, with many small pieces 

 of crystalline calcite, probably due to the infilling of the casts of corals, &c. Very 

 little can be seen in the incoherent materials under a lens, but thin sections [847] 

 show the following foraminifera embedded in a fine consolidated sediment, also with 

 obscure indications of casts of corals : — Carpcnteria, Polytrema miniaceum, P, plctnum, 

 Gypsina inhcerens, Amphistegina, and Heterostegina depressa. The largest chip in 

 the slide is 2 miliims. by 1'3 miliims. 



Depth from Surface, 567-57^ feet; Distance Bored, 11 feet; Total Length of Core 

 Ohtained, 2 inches; Nwmhers of Cores, 296a, 2966. 



With the exception of two small irregular pieces of solid core, the materials from 

 this 11 feet of the boring consist only of loose fractured particles of cream-tinted 

 rock of the same general character as the preceding. The particles are, however, 



2 G 2 



