214 DR. G. J. HINDE. 



about half of which consists of casts of PociUopora encrusted by Polytrenia plamna, 

 and TAtliothamnion, and half of fragmental materials, for the most part consolidated 

 and cemented by calcite, but in some of the cavities remaining as an incoherent 

 chalky-looking powder. The foraminifera include Orhitolites, Truncatulina, 

 Carpenteria, PoJytrema miniaceum, and Amphistegina Lessordi. Echinid spines, 

 pieces of Lithothamriion, &c. [528, 529, 530, G49]. 



Dept/i from Surface, 2S0 -24:0 feet ; Di.stcDice Bored, 10 feet ; Toted Length of Core 

 Obtained, ; Numhers of Cores {Unconsolidated), 187, 188. 



No solid cores were obtained from this 10 feet, only samples of ccxxrse and tiiie 

 fragments of limestone l)roken up by the drill. Professor David states that some of 

 the chips were 1 inch in diameter, ])ut none over 2^ inches in diameter ; these were 

 mixed with " coral sand." The fragments are whitish, angular, such as would be 

 produced by the pounding up of a rock similar to that of the preceding cores. The 

 principal recognisable constituents are foraminifera, often with worn surfaces, also 

 casts of individual corallites of Pocilloporcv, with a few echinid spines and alcyonariau 

 spicules. 



Details. 



(187) [850]. Mr. ClIArMAN dutcniiiiicd (ii//i.<iiiii i/hihnlns, .1 tii/i/Ns/ri/ina LcMonii, lav ga und \evy comnvm 

 I'ucilhipora casts, ika. 



(188). (Jrtiifolifrs iiKirfiliKiJis, I'ltlnirinit Insiiii/it, J iii/il/isfri/i/in. I'(irilhiii//ni laintf^. 



Depth from Surface, 240-280 feet ; Distance Bored, 40 fet ; Total Length of Core 

 Obtained, 1 inch; Nyjid)ers <f Co)-ex {UnconsolidrUed), 189-198. 



With the exception of an irregular nodule, about an inch in lengtli, of haid, whitish 

 rock, no solid cores were obtained from the boring between 240 and 280 feet; the 

 only specimens to show the character of the rock in tliis distance of 40 feet are the 

 loose, unconsolidated, fi'agmentary materials, produced maiidy by the grinding action 

 ofthe drill on the rock passed through. These are mostly angular chips of fairly 

 hard, white limestone of nmch the same character as those previously described. An 

 examination of the fragments under a lens, as well as of thin sections from them, 

 under a microsco})e, shows that foraminifera were numerous, and that the rock 

 consisted principally of these organisms in a fine deti'itus, now cemented together by 

 calcite. The remains of corals in this Ijroken-uj) material are not luunerous, Init there 

 are casts of PociUopora, fragments of Stylophora, and of some perforate coral. 

 Echinid spines are abundant, also sonie spicules of alcyonaria. llai'ely, stellate 

 ascidian spicules and entomostraca. The single piece of solid core consists of 

 ibraminifera and I'ragmentary materials. 



