234 DR. G. J. HIXDE. 



Details. 



(336). Length 46 millims. Cylindrical. AVhitish, moderately hard, porous dolomite rock. Casts of 

 Mudiepom, and Tiirhinaria, overgrown by Folyfiriita planum. The rest of core foraminiferal [556] with 

 MilioJina, OrJiitoUie^, rare, Amplnxfcciina, and Heterosfegirut. Echinid spines, casts of gasti'opods, and 

 HaVuDriJa. The corals are as usual destroyed, Imt a clue to their characters may be obtained occasionally 

 from the casts of their interspaces which have been filled by fine consolidated sediment. The white bands 

 of encrusting Pohjtreiita form a prominent feature in this rock. 



(337). Length 105 millims. Cylindrical core, scratched readily l)y knife, of cavernous and very porous 

 rock; largely of coral casts thickly encrusted with layers of Pol ijircma planum. The corals are Cjiphastra'a 

 resembling C. SavUjni/i, E. and H., and Porifes. The areas between the corals are filled almost wholly 

 with foraminifera, which are only partially cemented liy crystalline dolomite, so that there are numerous 

 pores. They include [557] Orhifdlifcs, Truncafnlina (J), Poli/tirma miniarpum, Gijpxma, Amplmiegina, and 

 Hefnut/cr/ina. The structure of the foraminifera only partially preserved. 



(338). Length 86 millims. Cyliiidiical core. Greyish-white, light, very porous rock, similar to the 

 preceding, but with a lesser proportion of corals. FuikjIh (one specimen), Afailirjiora, Puritf^, and Tiirhinaria 

 are present. Some of the corals are now preserved as a labyrinthic mesh-work lined l)y rhomliohedral 

 crystals: they are as usual overgrown by Pohjtrcma planum. The foraminifera [558, 559] include the 

 same forms as m the preceding core No. 337. Test plates of echinids, HaJimnla, and Lithothamnian. 



(339). Length 66 millims. Cylindrical, of dolomite [680], very similar to the preceding. Several 

 coral casts, one a specimen of OrhirrUa, encrusted bj- layers of Pohifrcma jiJanum, 12 millims. in thickness. 

 Carpi'nfrria, (r//psina, Ampliixifgina, Hrtcrostri/ina. 



(340). Length 53 millims. Cylindrical, of the same whitish-grey porous rock as the preceding, Avith 

 nodular masses of PoriUopora ^nd Poritrs {'l) encrusted by Piihjtrcma planum. Larger part of core [560] 

 consists of a packed mass of foraminifera including Orhitolifca, Disrorhina, Gi/imna, Air/phidcf/ina, and 

 Heterostegina , very abundant. Cast of laTucllibranch. Echini<l spines, Cheilostomatous polyzoa and 

 Halimeda. 



(341). Length 82 millims. Cylindrical. Kock dolomitic, soft, can be scratched by finger nail, very 

 porous, like the preceding. Mainly foraminiferal [561, 562, 563] Orhifoliien, Tcdularia, Carpcnieria, 

 I'oh/frema plannm, Gypdna, Amphistcgina, Jfrlrrosf/'gina, and ('i/rJocli/prus. Haliiiifi/a-ioints. 



(342) Length 38 millims. C^'lindrical ; whitish rock, porous, soft, can lie scratched in places by finger 

 nail. Cast of Maihrpora. Greater part of core foraminiferal [564a] M'ith (lloJiigcrina, ylmplmtcgina, 

 Hiffi'rosfcgiiia, and Ci/<'lorli/pr}is, numerous. llaVniwda-ynnta common. Large echinid spines. 



(343). Length 47 millims. Cylindrical core, soft, scratched l)y finger nail, light and miiuitely porous, 

 friable, so that it can be rubl)ed down into a finely crystalline white powder. Mainly of foraminifera [564]. 

 Large specimens of Cyfhdfipena ; Pohjlreina plannm, and other forms like those in the preceding core. 

 Halimfda. The organisms are very unfavoural)Iy preserved. 



Deptli fnnii Surface, 600-670 /ee^ ,• Distance Bored, 10 feet; Total Length of Core 

 Ohtaiued, 8 inches ; Numbers of Cores, 344-347. 



There are only four short cylindrical cores, altogether about 8 inches in length, from 

 this 10 feet of the boring. With one exception the cores are of a whitish, chalky- 

 looking, soft and porous dolomitic rock similar to those immediately preceding. Corals 

 are rare, Pocillopora, one cast of Fungia and another of Madrepo7^a were noted. The 

 cores are nearly entirely of foraminifera, in poor preservation, Cijcloclypeus being 

 the predominant form. One piece of core, No. 345, is of a hard greyish-white 

 dolomite, and differs so much in its hardness and general appearance from the soft 



