REPOET ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 287 



and small pieces of corals, and Lifhothainnion, cemented by crystalline dolomite into a very hard rock. 

 The foraminifera include MilioUna, Orhitolites coiiiplanala, Te.dulariu, Calmrinu, (h/psina, I'uli/lrcina, 

 Amphistegina, and Ci/cJorlf/peu!<. 



(591a). Length 172 millims. Greyish-brown, speckled, compact to porous, cavernous in places. 

 Hollow casts of Stylophoia, also casts of PociUopora throughout the core, probably in position of giowth 

 some are very much riddled with Cliona borings. Madrcpora. (Jrhifolifcs abundant; (lyp^inu, Puli/treina 

 planum, and Ainplmtcgina. Echinid spines. Casts of gastropods. Encrusting and fragmental LitJto- 

 thamnion. 



(592a). Length 271 millims. Rock similar to preceding. Casts of Podllopm-a, numerous, some hollow, 

 others solidly infilled with crystalline dolomite. Ca'loria, Orbicella, Parites arenosa, and other perfoliate 

 corals. Fragmentarj^ materials, with foraminifera and other organisms similar to the preceding, with 

 Halimeda in addition. 



(593a, 594a) [813]. Total length 405 millims. Greyish-brown, speckled, hard dolomite. As in the 

 two cores above, the principal coral here is Pocillopora, mostly as hollow casts, greatly riddled by Cliona 

 borings ; other examples are solidly replaced by crystalline dolomite ; Stylophom accompanies it ; the 

 corals not infrequently are overgrown by Polytren/a p)^o.num. Simple cylindrical Astrsean, also Pontes. 

 Millepmu and alcyonarian spicules. The fragmental part of the rock contains the same foraminifera 

 (except Textularia and Cydodypeus), and the same detiital organisms as No. 590a. Plulinwda, showing 

 structure, not uncommon. 



Depth from Surface, 1044^-1053 ye<?^; Distance Bored, 8^ feet ; Total Length of 

 Core Obtained, 7 feet 7 inches ; Numbers of Cores, 595a-607a. 



Solid cylindrical cores of greyish to greyish-brown, hard, dolomitic limestone. The 

 rock is in part compact, in part minutely porous, with hollows occasionally. Corals 

 are present in all the cores, but generally they are small, and the cores frequently 

 consist, to a very large extent, of the fragmental materials previously mentioned. In 

 some cores, however, the corals predominate. The genera present are Stylophora, 

 Pocillopora, Seriatopora, Astrcea, Orbicella, Madrepora, Fo7^ites, and an undetermined 

 perforate form. Millepora and alcyonarian spicules still occur. The fragmental 

 materials are generally fine-grained ; the following foraminiferal genera are included 

 with the other organisms : Orbitolites, Gypsina, Polytrema, Amphistegina, and 

 Heterostegina. Echinid spines, casts of lamellibranchs and gastropods. Cliona borings, 

 Serpula-tvihQB, Halimeda, and Lithothamnion likewise occur. Crystalline dolomite 

 cements the various fragmentary materials into a very hard rock. 



Details. 



(595a, 596a). Total length 218 millims. Greyish-brown, porous, cavernous in places. Coral casts 

 fairly numerous ; Stylophwa, Pocillopwa, Orbicella, Madrepaiu, and Pontes. Alcyonarian spicules. The 

 detrital materials contain the same foraminifera and other organisms mentioned above. 



(597a). Length 305 millims. Speckled, greyish-brown, compttct to minutely porous. With the 

 exception of casts of Seriatopo-ra, and of a small Madrepmu, the core consists of foraminifera and detrital 

 materials. Orhitolites abundant, Polytrema and Ampldstegma. Echinid spines. Halimeda. Encrusting 

 and branching Lithothamnion. 



(598a). Length 192 millims. Greyish, hard, compact to porous, cavernous in places where corals have 



