REPOET ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 263 



(28L4) [755]. Length 116 millims. Whitish-grey, hard, cavernous core, of dolomite similar to preceding. 

 Imperfect cast of an Astrrean and cast of Forites arenosa (?) Espbr, overgrown by Polytrema planum. Inter- 

 spaces between the corals filled with detrital materials containing Amphistegina, echinid spines, and 

 alcyonarian spicules in good preservation. 



(282a, 28.3a) [756]. Total length 104 millims. Greyish-white, banded, hard, cavernous, dolomite. 

 Casts of Asfrcpa, replaced by crystalline material, also of Fungia (1). Corals overgrown bj^ I'ob/freiiui planiiw, 

 and occasionally perforated by Lithodomus. Corals apparently form the larger part of the cores ; the 

 interspaces between are filled with organic detrital materials containing Glohigerina, Calcarina, Gypsina, and 

 Amphistegina, also with alcyonarian spicules. 



(284a-286a). Total length 181 milhms. Greyish-white, hard, compact to porous, cavernous. Casts of 

 the same Astra'a as in the preceding, also of Pmites arenosa. Polytreiaa planmii and Amphistegina. Serpula. 

 Hallmeda-jomts. 



(287a) [757]. Length 72 millims. Greyish-white, hard, for the most part compact. Casts of small 

 corals replaced by crystalline dolomite ; the only form recognisable is Pontes. Alcyonarian spicules. 

 Orhitolites, Carpenteria, Gypsina discus, Polytrema pilanwn, and Amphistegina. Nodular Lithothamnion. 



(288a) [758]. Length 97 millims. Core similar to preceding. Casts of Madrepora conteda and Porites 

 arenosa. Core mainly of corals, now replaced by crystalline dolomite, and the interspaces with fine organic 

 detritus ; they are encrusted by Polytrema pl-anum,. Alcyonarian spicules. Carpenteria, Calcarina, Gypsina 

 inhcerens, Amphistegina. 



(289a-291a) [759]. Total length 156 millims. Greyish-white, hard, dolomitic limestone, with occasional 

 hollows, in one instance (291a) about one-fourth the core is hollow. Faintly shown casts of Astrsean corals 

 and Pmites. Portion of stem of Lobophytum. The spicules in the stem are without any definite orientation, 

 they range to 2 "5 millims. in length by 0'54 millim. in thickness, their structure is well shown in 

 a microscopic section. The stem is partly overgrown by Polytrema jylanum. Orhitolites, Carpenteria, and 

 Amphistegina. 



(292a, 293a). Total length 159 millims. The rock is of the same character as the preceding. Casts 

 of Pmites and of other perforate corals too imperfect for recognition. Polytrema, Amphistegina. Echinid 

 spines. Nodular pieces of Lithothamnion. 



(294a, 295a). Total length 174 millims. Whitish-grey, with some spots of softer rock in the 

 lower part of 295a. Pocillopora, Astrcea, Goniastrce,a, Madrepm-a, and other small perforate corals 

 partly filled by matrix, partly as porous casts. Alcyonarian spicules. Detrital materials, with Orhitolites, 

 Gypsina, Polytrema, and Amphistegina. Halimeda. Lithothamnion. 



(296a). Length 155 millims. Banded grey and white, hard, compact, but with porous spaces. 

 The grey bands of crystalline dolomite consist of Porites, apparently in position of growth ; the 

 intermediate bands are partly of layers of Polytrema planum, partly of consolidated detrital materials, 

 with Orhitolites and Amphistegina. Casts of gastropods. 



Depth ft-om Surface, 874-881 /ee^; Distance Bored, 7 feet; Total Length of Core 

 Obtained, Q feet 2 inches ; Numbers of Cores, 297a-310a. 



Cores cylindrical, of whitish to whitish-grey, hard, dolomitic limestone, partly 

 compact, partly porous, with small hollows, but, as a rule, not cavernous. The cores 

 are largely composed of corals, apparently in position of growth ; the coral structures 

 mostly replaced by crystalline dolomite, and the interspaces either crystalline or 

 of detrital sediment ; they are better preserved than in the cores above. The genera 

 recognised are Pocillopora, Astrcea, Ooniastrcea, Cceloria, Madrepora, Turbinaria (?). 



