212 DR. G. J. HINDE. 



of HcJiopora rcrruJca ; the walls have disappeared, the larger and smaller tubes are infilled solid with 

 calcareous material. Echinid spines common. A microscopic section shows Glohigerina (seldom), Carpcnteria, 

 Poli/lrema mmiureuin, P. /iJaivnn, A inplmtegina Lessonii abundant. The section geneially like that of Core 

 No. 159. 



(167-169). Total length 208 millims. Two cylindrical cores and one nodular piece of the same kind of 

 whitish-grey rock. Numerous thin slit-like hollows about 5 millims. in width by 0'5 millini. in thickness, 

 which may be the casts of detached joints of Halimeda. Indications of Ileliojmnt. Echinid spines. 



(170). Length 150 millims. Core cylindrical, of similar rock to preceding. Some large cavities, one 

 80 millims. long by 37 millims. wide, now partially filled with cast of HrJiapora avndca. In another hollow, 

 a cast of a small form of Shjlophom in white, soft, friable material, which goes to powder with a touch. 

 The greater part of the core of fragmental materials. 



(171, 172, 173). Total length 138 millims. (No. 173 is not represented). Cores cylindrical, with large 

 cavities now partly filled with casts of Hrliopora nrmlm. The rest of the core fragmental, like the 

 preceding. 



(174). Length 10 millims. by 80 millims. in width. A mass of an AstrsTjan coral, perhaps Orhjrdhi. 

 The coral structure has been almost entirely removed, and the walls and interspaces are now replaced by 

 calcite. The coral apparently is in position of growth. 



(175). Length 125 millims. Cylindrical coi'e of the usual gj'cy hard rock with numerous small irregular 

 hollows. A])parently almost entirely of fiagmental materials, the only organisms recognised by the lens 

 are echinid sjunes and Amp]ii^t('<iina. 



Depth from Surfcice, 200-210 feet; Distance BoirxJ, 10 feet; Total Length oj Core 

 Ohtai'ned, 10 incites ; JVinnhers of Cores, 176-178. 



The 10 inches of solid cores consist, Avith the exception of a doubtful nodular 

 fragment, of moderately hard, whitish-grey or cream-tinted cavernous and porous 

 limestone, of the same character as that Avhicli has prevailed for tlie 30 feet above. 

 The rock principally consists of fragmental materials with foraminifera, the cavities 

 are partly filled with casts of corals belonging to Ileliopora and Goniastrcea. The 

 fine consolidated sediment in which the foraminifera are embedded is cemented by 

 calcite. There is little to indicate the nature of the organic fragments of which the 

 hollow casts remain. P]chinid spines are common. At the depth of 210 feet 

 the cores of 3 inches (75 millims.) diameter end ; for the rest of the distance, to the 

 bottom of the boring, the cores are about 2j inches (56-58 millims.) in diameter. 



Details. 



(176) [527]. Length 13 millims. An irregular nodule of MiUcjiora, much decayed, so that the suiface 

 can be scratched with the finger nail. It is extensively bored by Cliona. Its condition diilers so greatly 

 from that of the proximate cores, that Professor DAvm expresses a doubt whether it may not have 

 accidentally fallen into the bore from the surface. 



(177). Length 60 millims. Core cylindrical, of the usual cream-tinted porous rock. Nothing definite 

 can be recognised in it with a lens. 



(178) [645]. Length 150 millims. by 77 millims. in diameter. Core cylindrical, with large irregular 

 cavities and rnxmerous pores. Casts of lidiopora avnilra in soft powdeiy material, and Goniastrcea sj). 

 partially filhng the cavities. The greater part of the rock is seen in thin section under the microscope to 



