204 DR. Ct. .1. HINDE. 



upper cores are of the same kind of hard, mostly compact, coral rock which extends 

 from the surface to the depth of about 84 feet, below this the rock is more of a 

 porous character and softer so as to l)e more readily scratched by a knife. The solid 

 cores are almost entirely of corals belonging to Heliopora c(ervlea, PociUopora^ 

 Orbicella, Madrepora, Porites and AstrcBopora. The coral structures are preserved ; 

 the coral interstices are either empty or partly filled with radiating crystals of 

 " conchite." The spaces between the branches of the Pocillopora are infilled with 

 calcareous sediment containing numerous foraminifera and fragments oi' Litlwfham7iio)i 

 and Halimeda. According to Professor David, the part of the section not represented 

 in the cores consists of fine rubble and " sand " (detritus of calcareous organisms). 



Details. 



(94). Length 150 millims., by 81 millims. in diameter. A solid cylindrical core, nearly entirely of 

 Mwlrepora sp., growing over a fragment of Porites. The corallite.s mostly infilled with sclerenchyma. 



(95). Length 42 millims. A rounded nodule of compact hard rock, consisting of several successive 

 explanate layers of a perforate coral, (?) Porites. The coral is encrusted with Lithotha innion and perforated 

 by Cliona. 



(96) [514]. Length 33 millims. A fragment of whitish porous rock, consisting of OrtiiceUan]). The coral 

 interspaces either emjjty, partially tilled with fine sediment, or with radiating prisms of "conchite." 

 Amithistegina. 



(97, 98). Two nodular lumps of Heliopora rAi'riihu, one 60 millims. by 50 millims., the other 75 millims. 

 by 50 millims. The structure well shown ; the tubes for the most part empty and unaltered. The outer 

 surface pitted by boring organisms, Serpula attached. Also partly encrusted by Lithothamnion , and to 

 this orange-tinted annelid tubes are affixed. 



(99). Length 37 millims. A cylindrical core of white, porous, fairly hard rock, consisting of Astrceopora ; 

 the corallites are, in part, filled M'ith sediment, in part emptj'. 



(100) [515]. Length 75 millims. by 80 millims. in diameter. Rock similar to preceding ; the core 

 consists of a clump of closely arranged, branching, Poeilloporn, apparently near to P. gloiiierata, G.^RDlNElf. 

 The structure fairly well preserved, the corallites either empty or infilled with sediment or radiating 

 crystals of " conchite." The sediment filling the spaces between the branches of the coral contains the 

 following foraminifera, determined by Mr. Chapman : — Miliolina, Orbitolites, GJobigerina (rare), IMalia(1), 

 Trnnrufiilitia, Carpenteria, Pobjtreiua jilonmn, Gi/psina, Amphideqinu and Heferosfef/ind. Lithothamiiioii and 

 joints of Halimedn also occur. 



Depth from Surface, 90-100 /t'C^; Distance Bored, 10 feet; Total Length of Core 

 Obtained, I foot 1 inch; Numbers of Cores, 101-108. 

 The only pieces of solid cores from tliis 10 feet of the boring are six small irregular 

 lumps of porous whitish limestone, consisting of corals, including Pocillopura, 

 Orbicella, and Porites. These corals retain their structures in good preservation. 

 Nine feet of the boring are only represented by detrital materials, mainly triturated 

 fragments of hard coral rock with detached foraminifera, spicules of alcyonaria, echinid 

 spines, and joints of Halimeda. 



Details. 



(101). Length 63 millims. Cylindrical core, principally of a nodular lump of Porites inclosed in a mass 

 of lightly cemented fragmental material, mainly of alcyonarian spicules, Ampldsfegiiui, &c. 



