REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 251 



replaced by crystalline dolomite. Foraminifera numerous, embedded in a fine-grained sediment ; 

 Textidaria rugom, Caqienfcria, Calmrina, Gi/psimi, Polytrema, ylmphistegina, and Heterostegina. Gastropod 

 casts, one 30 millims. in length by 26 millims. wide at base. Halirneda, Lithothainnion. 



(136a) [725]. Length 92 millims. Greyish-white, mottled, hard, mostly porous. Cast of Madrepora C!), 

 in part hollow, in part filled in with crystalline dolomite, and enclo.sed by Lithofhamnion. Other small 

 coral casts not determinable. Infilled borings of Cliona. Foraminifera and detritus. Calmrina, 

 Gypaina, Poli/trema mimaceum, and Atiiplmtegina. Alcyonarian spicules, echinid spines. Lithoihamnion, 

 with the structure well preserved. 



(137a). Length 113 millims. Grey, mottled, hard, compact, with porous patches. General characters 

 like the preceding core ; a iew casts of small corals, filled with crystalline dolomite ; thick, undulating 

 layers of Lithothainnion, and an agglomerated mass of foraminifera and minute detritus. Polytrema 

 and AmphisteginM. Echinid spines. 



(138a). Length 88 millims. Greyish-white, compact to porous, very cavernous, where corals 

 have been removed. Core traversed by casts of a branching Pocillopora, showing a mould of the 

 calices in the walls of the cast. Foraminifera commingled in coarse detrital fragments. Orhitolites, 

 Gypsina, Polytrema, and Amphistegina. Lithotlmmnion. 



(139a, 140a) [726]. Total length 202 millims. Mottled, grey and white, hard, partly compact, 

 partly porous. Core mainly of thick, undulating layers of Lithothainnion, showing structure, and inter- 

 spaces now filled with crystalline dolomite, where corals appear to have been removed. A small quantity 

 of Polytrema planum, alternating with the Lithothamnion. Orhitolites, Gypsina inhcerens, Amphistegina. 

 Branching Pocillopom ; Alcyonarian spicules. Halimeda-joints. 



(141a). Length 100 millims. Whitish-grey, mottled and speckled. About half the core of layers of 

 LithotJiamnion, the rest of foraminifera and detritus. Pocillopora and Madrepora. 



(142a). Total length 199 millims. Greyish-white, hard, porous, with small cavities. Many casts 

 of small corals ; Pocillopora, which has been extensively bored by Cliona, and Madrepom conteda, partly 

 overgrown by Polytrema planum. Lithothamnion, in comparatively small amount. Foraminifera but 

 little shown. 



(143a, 144a). Total length 119 millims. Whitish-grey, mottled, mostly compact, with small cavities. 

 Casts of small corals, replaced by crystalline dolomite and very obscurely shown. Pocillopwa and 

 Madrepora. Polytrema planum. 



Depth from Surface, 798-804 yee^; Distance Bored, Q feet ; Total Length of Core 

 Obtained, ^feet 1 inch; Numbers of Cores, 145a-156a. 



Cores cylindrical, of greyish, greyish- white, mottled, hard, dolomitic rock, mostly 

 compact, but very cavernous, the hollows arising from the removal of corals. The 

 cores largely consist of casts of small corals, many apparently in position of growth. 

 The most persistent is Pocillopora ; with the exception of one specimen of Orbicella (?), 

 the other forms are perforates, belonging to Madrepora, Porit€s{V), and Montipo7-a (?). 

 They are all in an unfavourable state of preservation, the structure being either 

 entirely removed or replaced by crystalline dolomite, and they are frequently traversed 

 by a network of infilled casts of Cliona and other organisms, which remain after the 

 coral itself has been dissolved away. Foraminifera are hardly distinguishable under a 

 lens, the forms recognised belong to Carpenteria, Calcarina, Gypsina, and Amphi- 

 stegina. Polytrema encrusts the corals, often alternating with Lithothamnion, which 



2 K 2 



