304 DE. G. J. HINDE. 



species M. contecta. Other corals occurring with the Madrepora are Pocillopora, 

 rare, Ast7'cea (?) Orbicella, Montijjora, Porites, and an undetermined form. A few 

 examples of Millepora occur, and a single small specimen of Heliopora cierulea was 

 noticed, also detached spicules of alcyonaria. 



The corals are usually perforated to a varying extent by the borings of Cliona 

 sponges and other organisms, which are generally infilled with fine consolidated 

 sediment or with crystalline fibrous " conchite " or aragonite. The infilling sediment 

 contains numerous detached ascidian stellate spicules referred to Leptoclinum. No 

 traces of the siliceous spicules of the boring Cliona have been found in any of the 

 microscopic sections of the cores. 



If we except Polytrema planum, which, with Lithothamnion, is generally present 

 encrusting the corals, foraminifera are not of common occurrence in connection with 

 the solid cores, and they are limited to a few examples of Orhitolites, Spirillina, 

 Carpenteria, Calcanna, Gypsina inhcerens, Polytrema miniaceum and Amphistegina, 

 but in samples of unconsolidated material from depths of 40 and 70 feet, foraminifera 

 are very abundant, and many additional genera, the names of which are given below, 

 have been recognised. 



Of other organisms not already mentioned, there are in the solid cores and in the 

 loose material, detailed calcisponge spicules, echinid spines, Seipula, Spirorhis, 

 claws of Crustacea, entomostraca, stellate ascidian spicules, lamellibranchs and 

 gastropods, small coprolitic pellets, joints of corallines and of Halimeda. 



The solid cores from this Second Boring are generally similar to those of the First 

 and also to those of the corresponding depth in the Main Boring in being composed 

 mainly of corals, but whilst the predominant form in the Second Boring is Madrepora 

 contecta and Heliopora ccerulea is of rare occurrence, the reverse happens in the First 

 Boring (C), where Heliopora is extremely abundant, and only in one instance has 

 Madrepora been noticed. In the Main Boring, on the other hand, Heliopora forms 

 a marked feature in the upper part, whilst below the level of 40 feet from the surface 

 Madrepora contecta largely predominates. 



Foraminifera and other small organisms appear as a rule not to have been 

 consolidated into hard rock in the First and Second Borings, or in the upper part 

 of the Main Boring, and they form but a small part of the solid cores, but they are 

 extremely abundant in the loose, incoherent materials obtained at various depths from 

 these borings. 



Depth from Surface, 0-12 feet ; No Cores Obtained. 



According to Professor Soli-as the rock for a depth of 11 feet from the surface 

 consisted of fragments of coral, crystalline coral limestone, and partly consolidated 

 sand. 



