224 DK. a. J. HINDE. 



and dust pounded up by the drill. The cores are partly cylindrical, partly irregular 

 pieces of a greyish-white, moderately hard, cavernous and porous limestone, in 

 which very little can be distinguished witli a lens. Casts of Madnqjora are onlv 

 occasionally present. The rock, as seen in microscopic sections, principally consists 

 of foraminifera, entire and fragmentary, in a fine detrital material with polyzoa ; casts 

 of lamellibranchs, alcyonarian spicules, echinid spines, and Serpula tubes. The 

 organisms and mud are cemented by calcite, the pores in the rock are lined by 

 scalenohedral crystals. The powdered materials are angular, and blunted chips of 

 the same greyish-white rock as the solid cores, the only forms recognised amongst 

 them with a lens are some Aniplustegina with roughened surfaces, and small 

 fragmentary casts of PociUo'pora. 



Details. 



(253, 254). Two irregular fragments of hard, gre3'ish-whitc limestone, 38 millims. long, with alcyonariaTi 

 spicules, AmpMsteginu, and LitlKithaninion. 



(255). Length 67 millims. Cylindrical core, with hollows where corals have been removed. A nn'cro- 

 scopic section [662] shows that it is principally of consolidated fragmental materials and partly a fine 

 sediment. In it there are numerous l)rokeu pieces of Pohitirina pla/unn, together with OrUioJitex, Milialhia, 

 Carjicntcria, Foli/trciim iiiiniareum, Gypsina rcdailaris, var. disciis, .iiiijtliistciiiiia, and I[rfnvsfr;ihia. A single 

 delicate branch of MadrtjKua, cast only. Polyzoa. 



(256, 257). Length 31 millims. Two irregular fragments of rore similar to preceding. 



(258). Length 42 millims., diameter 55 millims. Cylindrical coie of whitish-grey limestone, cavities 

 partly occupied by casts of Matlrcpom. A microscopic section [663] shows that it is foraminiferal and 

 fragmental. It contains the same foraminifera as core 255, M-ith the addition of Tcriularia. Structure of 

 foraminifera fairly well preserved. Alcyonarian spicules, echinid spines, Serpula, and LitJiothamnmi. 



Depth from Surface, 517-526 feet ; Distance Bored, 9 feet ; Total Length of Core 

 Obtained, 1 foot 4 indies; Numbers of Cores, 259-2G7. 



The solid cores are in part cylindrical, in part irregular fragments of whitish and 

 greyish-white limestone, frequently cavernous. The cavities are produced by the 

 dissolution of corals ; they are in part occupied by the casts in sediment of the inter- 

 stices of the corals, and by the solid infillings of the borings of Cliona and other 

 organisms which remain as an intricate mesh-work of nodose calcareous threads aftei- 

 the structure of the coral has been dissolved away. The corals in these cores are 

 more numerous than in those immediately preceding, they consist of Pocillopora and 

 Madrepora, with a small quantity of Montipora. There is, further, a considerable 

 amount of encrusting Lithothamnion. The intermediate material is mainly frag- 

 mental, with foraminifera. Alcyonarian spicules, echinid spines, lamellibrauch shells, 

 and casts of gastropods. 



Details. 



(259, 260). Total length 60 millims. Two irregiUar pieces of whitish cavernous I'ock, with casts of 

 Pocillopora, Madrepora, and Montipora. Orhifolites, Amplmteyina ; small nodular lumps and branches of 

 Lithothamiiion. 



