KEPOKT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 235 



cores above and below, that Professor David questions if it is in its proper positioji. 

 A microscopic section, however, shows that it contains the same kinds of foraminifera 

 as the cores above and below, so that probably it belongs here. 



Details. 



(344). Length 35 millims. Cyliiidiical, whitish, c;in be scnitchecl by finger nail, light and very 

 porous. Fragment of cast of Fuwjia shown at one end of the core. Mainly foraminiferal [565], 

 Cijdodiipcus, Carj)cnteria, abundant, with Glohigeiina, Foli/treina plarmiii, Ainjilndt'ijina and Hrtcrush'ijiiui. 

 Echinid spines. 



(345). Length 55 millims. Cylindrical. Greyish-white, hard, somewhat porous. Casts of I'uciUtipora 

 and Madrepom. Alceolina [1), nodular lumjDS of Polijtreitm planum with large cells ; Ciirhichipcun ; Carpcnteria, 

 common; Ampliidegina Lesaonii ; Hekrosti'fjina deprcsm. ; Halimcda common; LithofJuunnlon. This core 

 contains a fair proportion of casts of corals, and the foraminifera are not numerous ; further it is hard 

 and in part compact [565a]. In spite of the differences between it and the cores above and below, the 

 occurrence of the same foraminifera, which have been determined by Mr. Chapman, leads to the belief 

 that it has not been misplaced, and in this case we have a hard layer of the rock intercalated between 

 soft beds. 



(346). Length 68 millims. Cylindrical core, of whitish, porous, soft dolomite, similar to Cores 342-344. 

 Mainly of foraminifera, partially cemented with minute rhombohedral crystals. In a microscopic section 

 [566] the following genera are shown: — OrbitoUie.^, Tcxtularia, Truncatidina, Globiyerina, I'oli/freina jiluniiin, 

 Ampliisteg'ma, Hetcrosiegina and Cijdodijpum. Echinid spines. 



(347). Length 38 millims. Cylindrical. The same white porous rock, apparently containing the 

 same foraminifera as the preceding. A fragment of a cast of perforate coral. 



Depth from Surface, 670-691 feet; Distance Bored, 21 feet; I'otal Lengtli of Core 

 Obtained, 1 foot 11 inches; Numbers of Cores, 348-356. 



From the 21 feet of this boring, the length of the cores obtained only amounts to 

 23 inches. The cores are cylindrical, very uniform in character; consisting of a milk- 

 white chalky-looking, light and very porous dolomitic rock, which can be scratched 

 by the finger nail, and is friable enough to be rubbed to powder between the fingers. 

 It is similar to the preceding 12 feet, from Core No. 341. The rock is mainly 

 foraminiferal, but occasional layers of Montipora and casts of Stylophora and an 

 Astrsean are present. The Montipora appears to be in position of growth. Amongst 

 the foraminifera Cycloclypeus is present in all the cores, but not in any great 

 numbers. Folytremct planum with the large cells continues. Polyzoa. 8ome Litho- 

 thamnion and Hcdimeda present, but not common. All the organisms are in very 

 unfavourable preservation ; they are lightly cemented by minute rhombohedra of 

 dolomite, many of which have darkened centres. 



Details. 



(348). Length 93 millims. Core cylindrical, of the usual white, porous rock. Casts of Montipora in 

 undulating horizontal layers, probably in position of growth. The coral structure removed away, the 

 interstices occupied by the dolomitic crystalline matrix. Core mainly foraminiferal [567] ; Glohigcrina, 

 Pohjtrema planum, with large chambers, Amplmtcgina, Hdcrodegina and Ciidodijpeus. Halimcda, 

 Lithofhamnion (?). 



2 H 2 



