260 DR. G. J. HINDE. 



(237a) [748]. Length 28 millims. Grey, hard, porous ; the pores and hollows lined with maramillated 

 crystalline deposit. Cast of Astrcva ; the structure replaced by crystalline dolomite, and the inter- 

 stices inJSlled with fine consolidated sediment. 



(238a). Length 250 millims. Greyish-white, hard, porous, with some cavities. Cast of Orhkella iV), 

 occupying about one-third of the core, also of Madrepora and other corals. They are now replaced 

 by crystalline material, and very indistinct. Pol ijtrema planum, Amphislegina (1). Lithofhamnion. 



(239a). Length 256 millims. Greyish-white, hard, minutely porous, and with some hollows. ^Mainly 

 of casts of small corals; Astrsean and branching Madrrjwm. Corals frequently enclosed by layers 

 of Polyirema plannm. Ainpjldstegina, Lithothamnion (?). 



(24:0a). Length 266 millims. Greyish-white, hard, minutely porous, and cavernous in places. 

 In the upper part of the core there are many casts of small corals, but too indistinct for deter- 

 mination. The lower part appears to be entirely of minute detritus, with foraminifera. rolytrenm plamnii, 

 Amphistegina. Echinid spines. Small gastropods. Lithothamnion. 



(241a). Length 77 millims. Whitish, moderately hard, porous, rough, showing efflorescence. ALainly 

 of detrital material and foraminifel'a, with casts of rocillopora and 3Iontipora (1). Amphidegina. 

 Casts of small lamellibranchs and gastropods. 



(242a). Length 317 millims. Cylindrical core, partly whitish, porous, rough to ieel, efi9orescent, 

 and partly grey, smooth and hard, with hollows lined by crystalline deposit. Both kinds of the 

 core principally of foraminiferal and minute detrital materials; the only organisms recognised with a 

 lens are Amphistegina, echinid spines, and Halimcda-joints. 



(243a). Length 93 millims. jSIottled, greyish-white, hard, mostly compact, with occasional cavities. 

 With the exception of two or three casts of small perforate corals, the core consists of foraminifera 

 and consolidated organic detritus. Polytrema planum, Amphistegina. Echinid spines. Ilalimeda. 



(244a, 245a). Total length 146 millims. Whitish, speckled, hard, mostly compact, with a large 

 longitudinal hollow, Avhich appears to have been originally occupied by a perforate coral. The rest of 

 the core similar to the preceding, of detrital material with great inim1)ers of Amphistegina. 



(246a) [749]. Length 230 millims. Whitish, hard, partly compact, partly with minute pores. Very 

 little can be distinguished under a lens, but a thiti microscopic section shows that the rock is nearly 

 altogether of a very fine organic detrital sediment, with some casts of small corals replaced by crystalline 

 mateiial, and with little more than the 1>orings of parasitic organisms infilled l)y the sediment now 

 remaining. The foraminifera include Glohigerina, not common, C'arpenferia (in fragments), and Amphistegina. 

 Echinid spines. Jlallmeda. 



(247a, 248a). Length 286 millims. Greyish-white, hard, mostly compact dolomitic limestone. With 

 the exception of a few obscure casts of corals, these cores are of consolidated detrital materials and 

 foraminifera, similar to the preceding. 



Depth from Surface, 853-8GG feet; Distance Bored, 13 feet'. Total Length of Cores 

 Obtained, 10 feet 11 inches; Numbers of Cores, 249a-27Ga. 



Solid cylindrical cores of whitish, greyish- white, generally hard, dolomitic limestone, 

 The rock is, for the most part, dense and compact, but some portions are porous, 

 rather softer than the compact grey portions, and occasionally efflorescent. Some 

 cores, moreover, are largely cavernous, the hollows are lined with crystalline material, 

 showing in section the agate-like disposition of the layers already referred to. The 

 greater part of these cores, to a level of about 864 feet (Core No. 269a), apparently 

 consist of foraminifera in a fine detrital organic sediment now consolidated and 



