BEPOET ON MATERIALS FliOM THE B0RINC4S AT FUNAFUTI ATOLL. 265 



(310a)]. Length 110 millims. Rock similar to preceding. Cast of Astrsean coral, Mudrcpora, and 

 small perforate corals. Core mainly of detrital materials, with foraminifera. I'ob/freiiut, j^^dnum 

 very abundant. OrJiiloIitcs, ADipliisteijina. Echinid spines. Gastropods. 



Depth from Surface, 881-890/cei(; Distance Bored, ^ feet; Total Length of Core 

 Obtained, 7 feet II itichcs ; Numhers of Cores, 3IIa-325a. 



Cores cylindrical, of mottled grey and white, hard, dolomitic limestone, in part 



porous, in part compact, with occasional hollows where corals have been dissolved out. 



In some of the cores the banded crystalline dolomite lines the cavities and replaces 



the corals. The cores are mainly of corals, as poorly preserved casts, some evidently 



in position of growth. The following genera have been recognised : Pocillopora, 



Sey'iatopora, Coeloria, Astrcea, Goniastraa, Fungia (?), Cycloseris, Madrepora, and 



Porites. Millepora, Lohophytum, and detached alcyonarian spicules also occur. 



With the exception of Codoria and Porites a^^enosa, most of the corals are small 



forms. The areas between the corals are occupied with fine detrital materials and 



numerous foraminifera belonging to Orhitolites, common, Planorhulina, Carpenteria, 



Calcarina, Gypsina, Polytrema, Nonionina, Amphistegina, and Heterostegina. 



Echinid spines, stellate spicules of Leptoclinum as casts. Serpula. Borings of Cliona. 



Lithothamnion. 



Details. 



(311a) [764:]. Length 338 millims. Whitish-grey, generally hard, but with white, softer areas, 

 compact to porous, Avith small hollows. Mainly of coral casts, Seriatopora, Astrcea, Madrepora, and other 

 small perforate corals, frequently overgrown by Polytrema planum. The foraminifera belong to Orhitolites, 

 Calcarina, and Amphistegina. Alcyonarian spicules, Cliona borings. Serpida. Casts of gastropods. 

 Lithothamnion. 



(312a) [765-768]. Length 427 millims. Greyish-white, hard, partly compact, partly porous, with some 

 hollows where gastropods and corals have been removed. Banded crystalline dolomite has infilled and 

 replaced many of the corals. Cceloria, Astrcea, Madrepora, and small perforate corals. Millepora, 

 Lohophytum, and detached alcyonarian spicules. Foraminifera, as in the preceding, with the addition of 

 Gypsina and Heterostegina. Casts of gastropods. Lithothamnion. 



(313a). Length 125 millims. Greyish- white, hard, compact to porous, with hollows lined by crystalline 

 dolomite. Madrepora {1), Porites arenosa. Orhitolites. Serpula. Lithothamnion. 



(314a, 315a) [769, 770]. Total length 138 millims. Greyish-white, hard, porous. The cores consist 

 mainly of a cast of Porites arenosa, apparently in position of growth. Also Madrepora (1) and other small 

 corals indistinctly shown. Orhitolites (abundant), Carpenteria, Gypsina globulus, Polytrema planum, and 

 Amphistegina. Sm^all gastropods. 



(316a, 317a). Total length 178 millims. Greyish-white, hard, partly porous, partly compact, with 

 occasional hollows. Numerous casts of corals ; PociUopwa, Coelmia, Fungia {%), Madrepm'a and Porites arenosa, 

 Orhitolites, Carpenteria, Polytrema, Cliona borings. Lithothamnion in small nodules. Professor David 

 considers this to be " essentially coral reef rock." 



(318a). Length 102 millims. Greyish-white, hard, porous where coral casts occur, About half the 

 core of casts of Astrcea (1), in position of growth. Madrepora, Orhitolites, Polytrema planum, Amphistegina, 

 LJthothamnion, Casts of gastropods. 



(319a) [590]. Length 266 millims. Whitish, with grey areas, which are mostly crystalline and 



2 M 



