266 1>K- C4. J. HINDE. 



compact, whilst the whitish are porous. Some hollows, in part containing the solid casts of Cliona and 

 other parasitic borings in corals, the structure of which has been dissolved away. Core mainly of corals ; 

 Pocillopora, Goniasfrcea, Madrepara, and Pontes arenosa. Corals frequently overgrown with Polijfrema 

 planitw. Orhitolites, Carpenteria, Gi/psina, Nonionina, AnqyliiAfeffma. Casts of gastropods and lamellibranchs. 

 Branching and nodular Litltofhamnion. 



(320a). Length 88 millims. Rock like preceding. jNIaiidy of coral casts ; Ifadrepairi and Porites. 

 Foraminifera, as in the core above. Echinid spines. 



(321a) [591, 592, 771]. Length 183 millims. Greyish-white, hard, except in some white patches where 

 the rock is partly decayed, generally porous. Mainly of casts of corals ; these are sometimes porous and 

 hollow, sometimes filled up with crystalline dolomite. I'orUlopora, ('(vloria (?), Ci/closens, Madrcpwa and 

 Porifes arenosa.' Fine detrital sediment, with numerous Orhifolit/'s and other foraminifera, as in 319a, with 

 the addition of Planorhidina, Calmriva, and H''ff/v.<feijina, which have replaced Uiipsina and Xnniimina. 

 Lifliofliaiiiiiinii. 



(322a, 323a). Total length 231 millims. Rock similar to preceding. Casts of branching PuciUopom, 

 Goniastnm (1), and other corals not determinable. Corals in part replaced by crystalline dolomite ; some 

 are hollow, and enclosed by thick layers of Poh/f renin /ilainnn. OrJiitohfi'^, Jinplmfegina. Casts of 

 gastropods. Fragments of LithotJiamnion. 



(324a, 325a). Total length 197 millims. Crey and white rock, hard, compact to porous, with large 

 hollows. Only faint casts of corals. The white portions of the core mainly detrital, with Orhitolites, 

 Poh/fremo, and .1 iiipliisft'ijiiia. Fi'agments of Litlii/tliaiimion. 



De^)th from Surface, S90-899 feet ; Distance Bored, 9 feet ; Total Length of Core 

 Obtained. S feet 5 inches; Nundfcrs of Cores, 326a-340a. 



Solid cylindrical cores of whitish-grey, grey, occasionally mottled, and banded 



dolomitic limestone. The rock is hard, partly porous, partly compact, and with some 



hollows where corals and gastropods have been dissolved away. The banded 



crystalline dolomite lines some of the cavities, and it solidly replaces many of the 



corals. Corals are generally distributed in these cores ; in some they form the larger 



part of the rock, in others the larger proportion consists of foraminifera and fragmental 



materials. The corals are in very poor preservation, and in most only faint traces 



are discernible. They belong to PociUoj)ora, Coeloria, Astr/i'ft, Madrepora, Porites, 



and Astntojwrcc. Porites is very abundant in some cores. Detached spicules of 



alcyonarians and one large specimen of Lohophytuni are present. Polyti-ema planum 



and Lithothamiiion are strongly represented. Orhitolites, Textidaria, Calcarina, 



Gypsina, Amp)histegina, and Heterostegina are present in the consolidated detrital 



materials, together with echinid spines, polyzoa, casts of gastropods, and stellates of 



Leptoclinum. Infilled borings of Cliona and other organisms retain their position in 



the hollows from which the corals have been removed. Professor David considers 



that these cores are essentially a coral reef rock, such as would probably have formed 



in shallow water. 



Details. 



(326a). Length 116 millims. Greyish-white, hard, compact to porous, with occasional cavities. 

 Principally of small corals, now replaced by crystalline dolomite. Cadoria, Madrepora, and others not 

 determinable. Orhitolites, polyzoon. Fragments of Lithofhuinnion. Borings of Cliona. 



