274 DR. G. .1. HINDE. 



where corals have been solidly replaced by crystalline dolomite. Cores principally of coral casts. 

 I'celoria, branching Madic-poia, and Pontes arenma. Foraminifera, as in preceding. Casts of gastropods. 



(415a, 416a). Total length 345 millims. Rock similar to preceding; mainly composed of corals. 

 Casts of Crelmia (in position of growth), Asfrcea loJiafa, Lam., Madrepom contecta, and Porift's arenosa. The 

 corals overgrown by layers of Polytrema planum and Lithothamnion. In detrital material, OrbitoHfes, 

 Carpenteria, and Amphistegina. 



(417a) [788]. Length 97 millims. Greyish-white, hard, porous. The core almost wholly formed of two 

 species of ( orals fairly well shown. The structure is for the most part replaced by crystalline dolomite, 

 while the interstices are in part lined by i-hombohedral crystals, in part empty. Prionushrm, cf. 

 P. magnifim* Blainv., and Asfrcea sp., Poh/trema planum, a.nd Amphistegina. 



(418a-420a). Total length 243 millims. Whitish-grey, hard, porous to compact, with small hollows. 

 Cores mainly of corals, often solidly replaced by crystalline dolomite. Asfrmi lobata, Mudnpiyra amfecfa, 

 Porites arenosa, and Astrceopora. Alcyonarian spicules. Detiital materials with (h-hitolites, Carpenteria, and 

 Aniplmfpgina. Branching Lithothamnion. Casts of gastropods. 



(421a). Length 110 millims. Greyish (compact) and whitish (porous). Core almost entirely of 

 Pontes arenosa with a fringe of consolidated detrital materials containing Orhitolites and Amphistegina. 



Depth from Surface, 945-957 feet ; Distance Bored, 12 feet ; Total Length of Core 

 Obtained, 10 feet 11 inches; Number's of Cores, 422a-442a. 



This part of the boring consists of nearly continuous, solid, cylindrical cores of 

 whitish to greyish-white dolomitic limestone. The rock is hard (H = 4), partly 

 porous, partly compact, in some portions it is whitish and less coherent. The cores to 

 a large extent are composed of corals, some replaced and filled up solid with crystalline 

 dolomite, and in part with fine sediment, in others the structure has been dissolved 

 away, and the s])ace is empty or merely lined with crystals. The corals in many 

 instances appear to be in the position of growth. They ])elong to the following- 

 genera : Pocillo2)ora common ; Cceloria connnon ; Goniastrcea, Astrcea frequent ; 

 Galaxea, Prionastrcea, both common ; Madrep07'a, Montipo7'a, Porites very common ; 

 and AstrcBopora. Also Millepora, Lobophytum, and detached alcyonarian spicules. 

 The spaces between the corals are filled in with fine consolidated detrital materials 

 containing OrbitoUtes, Globigerina, Carpenteria, Calcarina, Gypsina, Polytrema, 

 AmpJiistegma, Siiid Heterostegina. Casts of gastropods, echinid spines. Ldthothaninion. 



Cliona borings. 



Details. 



(422a, 423a). Total length 265 millims. Whitish, with thick grey bands, hard, partly compact, partly 

 porous. Corals inunerous. Prionastrwu 'inugnifjcu, Madreporu, Montipoia, and Porites areaosa. In the 

 detrital materials OrbitoUtes, Carpenteria, Amphistegina, Litliothamnion. 



(424a) [789]. Length 327 millims. Whitish rock, in places speckled, occasionally soft so that it scratches 

 readil}-^ with a knife, porous. Casts of Madrepora and Astreeopora. Alcyonarian spicules. The larger part 

 of the core is a fine detrital sediment containing OrbitoUtes, Carpenteria, Calcarina defrancii, Polytrema, 

 Gypsina inharens, Amphistegina, and Heterostegina. Echinid plates. Fragments of Lithothamnion. Casts 

 of gastropods and lamellibranchs. 



' Zooph. Diet. Sci. Nat.,' vol. 60, p. 340, 1830 ; also ' Man. Act ' Plate 54, fig. 3, 1834. 



