REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 245 



De2yth from Surface, 771-781 feet; Distance Bored, 10 feet; Total Length of Core 

 Obtained, 6 feet 11 inches; Numbers of Cores, 74a-96a. 



The cores from this 10 feet of the horiiig are closely similar in character to those 



preceding ; they consist of greyish to whitish-grey, hard, partly compact, partly 



porous and cavernous, dolomitic limestone. The rock contains casts of various corals, 



mostly of small size, but the larger part is composed of entire and fragmentary 



foraminifera embedded in organic fragmental material and fine sediment. The corals 



are casts only,, very imperfectly preserved; they include Pocillopora, Orhicella and 



other Astrasan forms, Fungia, Madrepora and Turbinaria. The foraminifera are, 



as a rule, also considerably altered, and their structural characters are obscured ; the 



most abundant forms are Polytrema planum and Amphistegina Lessonii ; of less 



frequent occurrence there are Orhitolites, Gypsina and Heterostegina. Lifhothamnion 



and HaHmeda. The lower cores from 86a downwards are somewhat harder and 



more compact, and the organisms are more clearly shown than in the cores above 



them. 



Details. 



(74a). Length 95 millims. Whitish-grey, minutely jjorous. Almost entirely of foraminifera and 

 detrital materials. PoJijtreina and Amphisiegina. Only the cast of one small coral noticed. 



(75a). Length 110 millims. Rock whitish-grey, similar to preceding. Some small coral casts, not 

 determinable. Mainly of foraminifera and detrital materials. Orhitolites and Aiiiphidegina. Echinid 

 spine. 



(76a) [705]. Length 10-3 millims. Rock similar to preceding. Casts of a few small corals too far 

 obliterated for determination. A microscopic section shows that the rock consists of fragmentary and 

 entire foraminifera belonging to Polytrema, Gypsina, Aniphistegina, and Heterostegina. Echinid spines. 



(TIa). Length 122 millims. Rock of same general characters as preceding. Casts of small 

 perforate corals, overgrown hy Polytrema planniii Mainly fragmental, with the same foraminifera as 

 in 76a. 



(78a, 79a). Total length 156 millims. Cylindrical cores of greyish, hard, minutely porous rock, with 

 occasional cavities. Casts of small corals, not sufficiently preserved for determination. Polytreina. 

 A mpkistegina and Heterostegirm are the only foraminifera distinguishable with a lens. 



(80a). Length 107 millims. Greyish, hard, very fine grained, minutely porous to compact. 

 Apparently altogether of foraminifera and organic detritus. Only forms recognisable with a lens are 

 Amphistegina and Heterostegina. 



(81a). Length 98 millims. Core of same character, and with the same foraminifera as the preceding. 

 A single cast of Fungia. 



(82a). Length 86 millims. Greyish-white, hard, minutely porous. Casts of several small corals, 

 including Madrepora. Greater part of core foraminiferal and detrital. Polytre.m.a planum, Amphi- 

 stegina, very numerous, and Heterostegina. 



(83a). Length 55 millims. Grey, hard, fine-grained, mostly compact. Cast of Porillopora. Alcyonarian 

 spicules. Serpula-tnbQs. 



(84a). Length 56 millims. Core like preceding. Cast of small Pocillopom. Alcyonarian spicules. 

 Amphistegina. Cast of lamellibraneh. 



(85a). Length 64 millims. In part grey, in part white, hard, porous, with cavities where 

 corals have been dissolved out. Casts of Madrepwra and other corals not determinable. Polytrema, 



