REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 223 



(238). Length 20 inillims. A t'r;igiuciit of cavcrnDUs wliitc rock, showing CHSt.s of Mudn'pura and 

 Amphistecjina. 



(239). Length 80 millims. Cyliudiical core of whitish, porous rock, some casts of corals, and a laige 

 amount of Litiiufhuitnuon. Sedimentary material with ^iiiqilii^fcgina and echinid spines. 



(240). Length 100 millims. by 55 milims. in diameter. Cylindrical core of whitish-grey, cavernous 

 and porous rock, with casts of perforate corals, 'i MadiTporu. A microscopic section [660] shows that the 

 rock is largely of a very fine calcareous sediment with casts of gastropods, echinid spines, foraminifcra, 

 pieces of LifJtothaianion, andHaliuwda. The following genera were determined by Mr. Chapman : MUiolmu , 

 Orbifolitf's, Cm-penteria, I'ol//fri'iiia iiiiniareinn, P. planum, and G'l/psina. 



(241). Length 80 millims. Cylindrical core, rock similar to preceding. Cast of Madrepom. A 

 considerable amount of Lifhofhainnion ; echinid spines. 



Depth fivm Surface, 497-505 feet; Distance Bored, 8 feet ; Total Length of Core 

 Ohtained, 10 inches ; Numbers of Cores, 242-252. 



With the exception of one cylindrical ]3iece, the solid cores are irregular fragments 

 of limestone, partly rounded by drill. The rock is whitish and whitish-grey, hard 

 and cavernous, where corals have been dissolved away. The corals are very imperfect 

 casts of Mctdrepora. The greater part of the rock is a very fine calcareous sediment, 

 filled with minute organic fragments, with foraminifera, echinid spines, Lithot.hamnion 

 and casts of gastropods. A sample of loose, broken-up fragments of white rock 

 brought up by the sand-pump, corresponds in character to the rock of the solid cores, 

 the only organisms recognisable in it with a lens are Amphistegina, Heterostegina, 

 and fragments of Pocillopora. 



Details. 



(242). Length 22 millims. An irregular fragment of hard whitish-grey rock, with poorly shown casts 

 of perforate coral. 



(243). Length 48 millims. A piece of similar rock to preceding, cavernous where Madrepora had been 

 partially dissolved out and in part porous. A microscopic section [661] shows that the rock is mainly 

 composed of fine calcareous sediment with minute organic particles and specimens of MilioUna, OrhUolites, 

 Cci'ipenferia, and PolijtreiHa niiniareiiiii. Spines and plates of echinids, also numerous small detached 

 pieces of Lithothamnion. 



(244). Core not in place. 



(245-251). Irregular pieces of white rock, with a total length of 120 millims. ; there are, in some 

 pieces, casts of branching Madrepora, but the greater part of the rock is of consolidated calcareous 

 sediment, similar to the preceding core, No. 243, the only organisms visible under a lens are echinid 

 spines and fragments of Litliothamnion. 



(252). Length 80 millims. Cylindrical core of greyish-white rock, with casts of branching Madrepora 

 extending vertically through it, the hollow casts enclosed by consolidated detrital sediment, with echinid 

 spines, Lithothamnion, &c. 



Depth from Surface, 505-517 feet; Distance Bored, 12 feet ; Toted Length of Core 

 Ohtained, 7 iiiches ; Numbers of Cores, 253-258. 



Only a length of 7 inches of solid core was brought to the surface from the 12 feet 

 of boring ; the remaining 1 1 feet 5 inches being scantily represented by small rock chips 



