REPORT ON MATERIALS FROIM THE BORINGS AT FUNAFUTI ATOLL. 29 1 



(634a). Length 305 millims. Greyish-brown, speckled, toinpaet to minutely porous, with few hollows, 

 very hard. Casts of rocillujjura, Astrsean coral and some perfoi'ute forms, not determinable. Millepwa, 

 alcyonarian spicules very abundant. Siime foraminifera as in No. 630a. Lithotltainnion. 



(635a, 636a). Total length 318 millims. The rock is of the same character as the preceding. Casts of 

 small forms of Sfijlojjhora, PociUopoia, and Astrtean corals. Millepora. Alcyonarian spicules numerous. 

 The corals are generally overgrown with FoJjifn'uKi j/lmium and Lifltothanmion. The same foraminifera as 

 in 630a. Cast of lamellibranch. 



(637a, 638a). Total length 249 millims. The same greyish-brown dolomitic limestone as the preceding 

 cores, and the organisms are also similar. Poeillopora, jShidrepom (1) and other perforate corals, now solidly 

 replaced by the crystalline matrix. Alcyonarian spicules numerous, manj^ are now decomposed to a loose, 

 white, powdery material. Foraminifera as before. Echinid spines. Lithothanmion abundant. 



(639a, 640a) [821]. Total length 168 millims. Rock similar to preceding. The minute interspaces 

 lined with mammillary crystalline deposit. Slylophom (?) perforated by Lithodonmis, and some perforate 

 corals, genera uncertain. Fragments of corals are present in the detrital materials. Alcyonarian spicules. 

 The foraminifera shown in the microscopic section belong to OrbitoUtes, Carpenteria, Gypsina inhcerens, 

 Polytrema, Anipliistegina, Heterosfegina, and a fragment of Cydodypen:<. Echinid spines. LifJwfhamnion in 

 nodular masses and fragments. The greater part of the cores consist of foraminifera and fragmental 

 materials. 



(641a). Length 150 millims. The same greyish-brown dolomitic rock as in the preceding cores. Cast of 

 a branching coral, belonging to Eiiphyllia or an allied genus, extends the length of this core. The cast is 

 partly hollow, partly filled with the crystalline matrix. Alcyonarian spicules very numerous. Foraminifera 

 scarcely shown, only OrbitoUtes recognised. 



(642a, 643a). Total length 176 millims. Cores of greyish -brown, hard, crystalline dolomite, compact 

 mostly, cavernous. Only traces of corals overgrown by Polytrcina pilanum. Alcyonarian spicules. OrbitoUtes, 

 Amphistegina. Echinid spines. Lithothavmion. 



Depth from Surface, 1075-1087 y^e^; Distance Bof^ed 12 feet ; Total Length of 

 Core Obtained, 10 feet 6 inches; Numbers of Cores, 644a-661a. 



Solid cylindrical cores of greyish-brown, hard, dolomitic limestone, for the greater 

 part dense and compact, the lower cores are cavernous. The rock has been much 

 altered and doiomitised, so that its organic character is now largely obliterated. 

 More particularly is this the case where corals have been present originally. They 

 have been so replaced and infilled with crystalline dolomite that only faint traces of 

 their structure can now be recognised. The following forms have been distinguished ; 

 Stylophora, Pocillopora, Seriatopora, Orbicella, simple Astrsean, Fungia, Fungids of 

 doubtful genera, Cycloseris (?), Madrepora, and other perforate corals, Millepora ; 

 detached alcyonarian spicules. The greater part of the rock consists apparently of 

 foraminifera and minute detrital organic fragments. The former include OrbitoUtes, 

 Planorbulina, Carpenteria, Pulvinidina, Calcarina, Gypsina, Polytrema, Amphiste- 

 gina and Heterostegina. Echinid spines, casts of lamellibranchs and gastropods. 

 Lithothamnion, Halimeda (?). Cliona borings. 



Details. 



(644a) [822]. Length 311 millims. Greyish-brown, compact to minutely porous, with occasional 

 hollows. Coral casts of small size are fairly numerous; they include Pocillopora, Fungid, Cycloseris, 



2 P 2 



