198 DR. a. J. HINDE. 



have been originally filled with incoherent chalky mud, which has been washed away in the diilling; and 

 extraction of the core. 



(20). Length 103 millims. Character similar to preceding, principally of ))ranching and encrusting 

 LifJiuthanDtioii. In the hardened calcareous mud I'lili/frcnni luiinin-cinii, retaining the pinkish tint, also purple 

 echinid spines. 



(21, 22) [611]. Length 133 millims. Core cylindrical. The Hr'liojtont carHlca is more prominent than 

 the LMtithawnion in these cores. Its structure is well preserved, the tubes are partly empty, partly filled 

 in with fine detrital mud. Laminate undetermined coral, the same as in core 19; its structure is masked 

 by sclerenchyma and prisms of " conchite," and it is also extensively bored by algae. The corals overgrown 

 by Lithothamnion and Foli/f/niui phriiiiut. In the consolidated mud Orhifoliic^', rarelj^ ; some detached 

 3-rayed spicules of calcisponges ; Lcptocliiiiini stellates, echinid spines, SfrjuiJa-inhea. 



(23). Length 38 millims. Of the same matei'ials as the preceding core ; a commingling of Hi'Hopura 

 irirulm and Lithothainniun, with detrital mud containing echinid spines, PoIi/fmiKi, coprolitic pellets, &c. 



(21) [612, 613]. Length 120 millims. Core cylindrical, consisting of a very cavernous mass of Heliopora 

 crnnlea, an undetermined coral, Foli/fnnim planum and lAfltoiliaiiiiiion. Stellates of LcptorHiniin, abundant in 

 mud, echinid spines, Carpfiifflria and P. miniacenm. Professor David states that this is an undoubted reef 

 rock in .titii. 



(25). Length 69 millims. Like the preceding. The Ilclinpom is growing in thick upright laminae, with 

 the structure preserved ; it is extensively tunnelled by Clioiia sponges and other organisms. In the detrital 

 calcareous mud there are large purple echinid spines and a few joints of IlaUuicdu. 



(26) [614]. Length 50 millims. Nodular lump, mainl}' of Litliothaianion, with some small pieces of 

 Heliopwa cwrulm; encrusting Pdhitn'ina planum abundant, frequently alternating with LitJiDtliumnion. 

 Echinid spines, Leptodinum spicules, Orhitolites, Glnhif/erina, rare. 



(27-31) [509, 615]. Rounded nodular pieces of core, with an aggregate length of 171 millims. Consist- 

 ing of Heliopora and LifJiothaninwii, generally similar to the preceding. Halimeda, stellate spicules of 

 Lfptoclinum, minute fragments of Heliopora, &c., in the consolidated mud. Plaropdlina. 



(32) [508, 627]. Length 118 millims. Cj'lindiical core, consisting principally of a perforate coral, so 

 infilled with sclerenchyma that it caiuiot be determined Avith certainty. It may possibly belong to 

 Madrt'pora. The coral is overgrown by successive thin layers of Lithothamnion. Partially coherent 

 foraminiferal and fragmental material, containing Orhitolites, Polytrema miniaceuw, LepforUnnm stellates, and 

 coprolitic pellets, surround the coral. 



(33). Length 95 millims. Hard greyish, very cavernous core, consisting of Heliopora rnrulea, an 

 undetermined perforate coral, branching LitJiotJiainnion, and echinid spines. 



Depth from Surface, '6Q)-iO ftft ; Distance Bored, 10 feet ; Total Length of Core 

 Obtained, ^ feet 4 inches; Numbers of Cores, 34-55. 



The cores are of whitish grey limestone, hard, cavernous to compact, mainly an 

 agglomeration of corals and calcareous algae, surrounded by fine sedimentary material 

 with foraminifera, echinid spines, stellate spicules of ascidians, small fragments of 

 corals, Lithothamnion and Halimeda. The principal corals are Millejyora, Heliopora, 

 Pocillopora, Sti/lophora, Madrepora, and Montipora. The corals retain their structure, 

 but they are largely perforated by boring organisms, and the interspaces are mostly 

 infilled with sclerenchyma or witli prisms of " conchite," which mask their characters. 

 The foraminifera belong to OrbitoUtes, Flacopsilina, Discorbina, Carpenteria, and 



