210 DR. G. J. HINDE. 



fragmeiital materials. Pieces of Madrepora and Porites, also of alcyonaria are 



present, which are consolidated with tlie smaller organisms by calcite. The 



remainder of this 10 feet of core consists, according to Professor David, of " sand" 



or " coral" rubble. 



Details. 



(144) [523, 524, 639]. Length 85 millims. Cylindrical core, slightly cavernous, where the fragmenta 

 materials have not been consolidated. Microscopic sections show that the rock is comj^osed of foraminifera 

 and other organic fragments. The foraminifei-a belong to Orhit(ililr>t, Dhcorhimt, Tciiiiluriu, Truncutnlinu, 

 Carpenteria, Globujerina, Polytrcinu, Aiiijihi^tei/ina, and Ili'lcrodegina. They ar-c in good preservation and 

 their minute structure is distinctly shown under the microscope. Eehinid spines munerous. Branching 

 and encrusting Lifhuthamnion, Haliimda joints. 



(145) [640]. Length 100 millims. Cylindrical, somewhat porous in places. With the exception of a 

 nodular piece of Pmites, encrusted by Lithothamnion, the rock is foraminiferal, similar to the preceding. 

 Alcyonarian spicules, eehinid spines, small gastropod. Halimcda. 



(146) [641]. Length 40 millims. A nodular lump of cream-coloured rock, rounded by diill, porous. 

 A thin section under the microscope shows that it is a mass of alcyonarian spicules, probably a poition of 

 a stem of Lohophytam. The spicules are partiall}' decaj'ed, the interspaces are filled l)y calcite. 

 Amphi-'ifef/ina. 



(147). Length 55 millims. Cylindrical, cavernous, also with small holes where organic fragments have 

 been dissolved out. Apparently fragmental, the oidy organisms recognisable by a lens ai'e eehinid spines 

 and A/iq)liisffr/i)ta. 



(148). Length 60 millims. Kounded core of dense greyish rock, apparently Madirpmu ; structure 

 indistinct. 



(149,150). Length 55 millims. Two nodular pieces of porous rock, apparently fragmental, similar to 

 No. 147. 



Depth froyn Surface, 1^0-1^0 feet ; Distance Bored, 10 feet ; Total Length of Cove 

 Obtained, \ foot 2 inches ; Numbers of Cores, 151-158. 



The solid cores are for the most part small ronnded pieces, but in two instances 

 they are cylindrical. The rock is greyish-white limestone, moderately hard, cavernous, 

 where fragmental materials have not been consolidated, and distinctly porous, with 

 numerous small holes, frequently with the definite outlines of some organism which 

 has been dissolved away. One small j^iece of core consists of the stem of an 

 alcyonarian, probably Lobophytum, the remainder apparently are mainly composed of 

 foraminifera and fragments of organisms, consolidated by calcite. For the first time 

 in this boring coral casts occur, in which the coral walls have been dissolved away, 

 while the interstices, infilled with calcite, remain. The replaced corals are small 

 examples of Stylophora and PociUop>ora, there are also other fragments which 

 appear to l)e casts of Ileliopora ccerulea. The remainder of this part of the boring, 

 according to Professor David, is of " sand" or fine rubble. 



Details, 



(151) [642]. Length 23 millims. A portion of a cylindiical core of hard cream-tinted rock composed 

 of alcyonarian spicules forming jjart of a stem of Lohaphiitinn. They are in the same state of preservation 



