812 DT^. G. J. HIXDP:. 



the materials. They have been carefully examined by Mr. F. Chapman,* m connec- 

 tion with the recent forms distributed over the surface of the lagoon floor, which he 

 has already described. The commoner forms belong to 07'hitolites, Sagenina, 

 Textularia, Planorhidina, Calcarina, Gypsina, Polytrema, Amphistegina, and 

 Heterostegina, whilst those of sparse occurrence comprise Spiroloculina, Miliolina, 

 Placopsilina, BcJcUoidina, Haddonia, Sagrina, Glohigerina, SpiriUina, Discorhina, 

 Truucatidina, Anomalina, Carpenteria, Pidrjnnlina, and Polystomellci. The genera, 

 and with a few doubtful exceptions, the species as well, have been recognised by 

 Mr. Chapman in the dredgings from the floor of the lagoon. With the exception of 

 the naturally attached forms, the foraminifera, like the Hah'meda-^ointH, are quite 

 free, and their condition of preservation is ])ractically the same as that of recent 

 specimens. 



Corals are not common in the materials from the upper part of the boring, 

 the only forms met with are small broken fragments of Seriatopora, Madrepora, 

 and Porifes, a small specimen of Heliopora ca'ndea, and some detached alcyonarian 

 spicules. 



Other organisms found in this part of the boring include spicules of calcisponges, 

 ecliinid spines, and plates, Sjnnvhis, Serpida-twhes, claws of small Crustacea. 

 Leptodinum stellate spicules, polyzoa, T/iccidea maxiUa, small lamellibranchs and 

 gastropods, and coprolitic pellets. 



Details. 



(L. 2). 21i feet. The siimple is nearly entirely of the bleached HaJini'iJa-ynnt^i, with foianiiniferu in 

 the finer calcareous materials, principally belonging to Xagcnina fivnilf'srcns, (iiiimina (jloliuUix, (i. trsiaildris, 

 dnlniriiKi liiqndu, Jiiijjliisf<-(/)iui [j'ssonii, and JL'fcro'^fcfiina depresm. Altogether, Mr. Chai'JFAX has 

 determined twenty-four species and varieties ; the greater luimber are I'are. Eehinid spines, Scrpnld 

 IhiinJia, polyzoa, small gastropods, and lamellil)ranchs. No coral fragments ol)served. 



(L. 3) [451, 452]. 35i feet. Very like the preceding in the great proportion of ]{<iliiiicil(i-]omt». These 

 are now, to a certain extent, infilled with secondary carbonate of lime, and more rigid and stony than those 

 found nearer the surface. Small fragments of rid)bly and powdery limestone, in which Sn-iafojxini, 

 Mailri'/xmi, and rorilcs can be recognised, occur. Foraminifera are less numerous than in the preceding 

 sample ; the commoner forms lielong to (////isina, J'olf/fr''iiia, Aniji/nstci/ina, and Hcferos/ft/iuK. .Alici'oscopic 

 sections fjf nodular fragments of the rock show consolidated calcareous sediment, with foraminifera, 

 eehinid spines, spicules of Lf/ilorlinuni, and snuiU gastropods. 



(L. 4). 50 feet. The sample from this depth contains the same large amount of HuUiiii'ila-]omU as the 

 samples aboAC. The tubes and cells of the HaHim'da are more generally infilled with the secondary 

 carboiKite of lime, but their minute structure is still well preserved. The oidy corals recognised are broken 

 fragments of Scridtoponi. All the genera of foraminifera present in the upper part of the boring occur in 

 this sample, with the exceptioji of Oh/hit/t'i-iini. !Mr. Chapman has determined thirty-nine species and 

 varieties. Other organic constituents comprise spicules of calcisponges, eehinid spines, Srrjinln, Buinlia, 

 polyzoa, Thenih'ii, small lamellibranchs and gastropods, and coprolitic pellets. 



(L. 5). 62 feet. The Halimeda-joints are as numerous and in the same condition of preservation as in 

 the preceding samples. They are often encrusted by Pah/tir/ixi jilcnvim and overgrown l)y a network of fine 

 calcareous threads, possibly some other form of calcareous alga. Polyzoa and other organisms arc ah^o 



* ' Linnean Soc. .Tourn.,' Zoology, vol. 28, pp. 161-210. 



