240 DR. (4. J. HINDE. 



(18a, 19a, 20a). Total length 140 millims. Cores, cylindrical, soft like preceding. The same 

 foraminifera as in the previous core. No corals noticed. Halimeda. 



(21a) [687]. Length 82 millims. Whitish, porous, hard, with some small cavities mainly of foraminifera ; 

 AJrfiolina, Poli/frcina planum, forming nodules, some of which are 48 millims. in diameter ; Gi/jmna gJobnhix, 

 Amphisferjina, and HeteroMpgina, both large and numerous ; Konionina. Only one piece of perforate coral 

 noticed, probably Madrepmv. Halirnrda ; thin crusts of Lifhofhainnion. The organisms lined liy 

 rhombohethal crystals of dolomite. 



(22a) [G88]. Length 97 millims. Rock of same character as preceding. Mairdy foraminiferal ; OrhifoUfrs, 

 Alvsolina, Gloliigeiina, Polytrema, A mphisiegina , and HcU'ioMcgina. Cast of Ci/closcris and of small perforate 

 coral. Halimeda, Litlwthamnion. Casts of gastropods. 



(2.3a, 2-I:A). Total length 166 millims. Cylindrical cores of whitish, hard, very porous rock, similar to 

 the preceding. Almost entirely of foraminifera, the only coral observed is a cast of a small A.straean. The 

 most prominent foraminifera are the nodular lumps of ro]//fri'mn planum ; between these Amphisfrgina 

 and Hctcrodi'fiina are packed, but there are no signs of any arrangement in l)edding layers. The interspaces 

 are lined, but not infilled, with the dolomitic crystals. Halimrda and Lifhotliamnion. 



(25a) [689]. Length 103 millims. "Whitish, hard, nearly compact, dolomitic limestone. The foraminifera 

 in this core are very closeh^ packed together, and the interspaces are largely filled up with crystals of 

 dolomite. They comprise OrhitoliU's, BdcUoidina, Ghhigerina, Gjipdna, Pohjtrema pJannm, Ampltistpgiva, 

 and Hdei'o^iegina. Cast of Ci/rlo.^erix. Plates of echinids. Halimeda. 



(26a, 27a). Total length 164 millims. "Whitish, hard, partly porous, partly compact, principally 

 of foraminifera similar to the preceding. Cast of Cjidoiierix (?) and of a perforate coral. Casts of lamelli- 

 branchs. 



(28a) [690]. Length 56 millims. Rock similar to the preceding. Cast of Ci/phasfrcea and of a perforate 

 coral. !Maiidy foraminiferal. J)isrorhina (?), Carpenferia, I'oJi/firma planum, Amphixfcgha, and Hrffiosfegina, 

 very numerous. 



(29a, 30a). Total length 95 millims. Whitish to cream-coloured dolomitic limestone, in part porous. 

 Almost wholly of foraminifera, of the same kinds as in the preceding cores. Casts of Ci/rlosfris. 



(31a). Length 98 millims. Whitish to grey, hard, very porous in some places, in others nearly 

 compact. Casts of Ci/rhsrris and of Pontes. ]\Iainly foraminiferal; J'dli/trcma jilanum, foiming laige 

 irregular nodules, A mj/histegina and Hetei-ostegina, numerous. Alcyonarian spicules. JJihuthamnitm. 



Depth from Surface, 7 4:8-7 6^ feet ; Distance Bored, \b feet ; Total Length of Core 

 Ohtained, 7 feet 1 inch; Numhers of Cores, 32a-54a. 



The solid cores from this part of the Iwring are nearly half the length of the 

 distance passed through, and, from this to tlie hottom of the horing the proportion 

 of the solid cores is about 85 per cent, of the boring, or, in other words, each 10 feet 

 of the boring is represented by 8^ feet of solid cylindrical rock-cores. The cores 

 between 748 and 763 feet are of whitish-grey, hard, porous to compact, and 

 occasionally cavernous, dolomitic limestone. The degree of porosity depends on the 

 extent to which the interspaces between the organisms have been filled up with 

 the crystalline dolomite which cements them together. In some of the cores, 

 moreover, there is fine amorphous sediment, now consolidated, in the spaces between 

 the foraminifera, &c. The cores of the upper portion, Nos. 32a-36a, between 

 748 and 752 feet, consist principally of foraminifera, with occasional casts of corals; 

 below 752 feet to 763 feet the same foraminifera are present, but they are associated 



