REPORT ON .AIATERTALS FROM THE BORINGS AT FUNAFUTI ATOLL. 277 



extent, of corals, now either solidly replaced by crystalline dolomite or with the 

 structure dissolved away, and the interstices are lined with crystals or infilled with 

 consolidated sediment. The following genera are represented : Pocillopora, common ; 

 Seriaiopora, rare ; Coeloria, Astrcm, and other undetermined Astraeans ; Fv,ngia, 

 Madrepora, common ; Montipora, Porites, \Qvy common, and growing in large masses. 

 MiUepoi'ct, Lohophytum, alcyonarian spicules. The detrital material between the 

 corals contains Orhitolites, Phicopsilina, Textidaria, Carpenteria, Gypsina, Polytrema, 

 Amphistegina, and Heterostegina. Also - echinid spines, Serjnda-tnhes, casts of 

 gastropods and lamellibranchs [LitJiodoinus). Lithothamnion. Cliona borings. The 

 organisms are cemented by crystalline dolomite, but frequently this material does not 

 completely fill the interspaces. 



Details. 



(450a-452a). Total length 371 millims. Whitish-grey, hard, partly porous, and with small 

 hollows. Mainly of coral casts. Pocillopora, Oa'loria, Adrcea lohata, Montipom (?), and Porites arenosa, in 

 large masses, to 115 millims. in length, and wider than the core. They are apparently in the position of 

 growth. The Porites occasionally bored by Lithoclomus, the shell of which is still present in the boring. 

 The detrital material contains Orhitolites, Carpenteria, Polytrema planum, and AmpliMerjina. Casts of 

 lamellibranchs. Lithothamnion. 



(453a), Length 248 millims. Whitish-grey, similar to preceding. Casts of small examples 

 of Madrepora and Porites. Alcyonarian spicules. Larger part of the core of detrital materials, with 

 foraminifera, as in the core above. Serpula-tvibes., Branching Lithothamnion. 



(454a, 455a). Total length 216 millims. Whitish, speckled, minutely porous. The upper core 

 consists chiefly of casts of Pocillojwra and Porites arenosa. Alcyonarian spicules. The lower core, 

 mainly of fragmental materials, with Orhitolites, Carpenteria, Ampihistegina (very abundant), and 

 Ifeterostegina. Numerous fragments of LitJwthamnion. 



(456a, 457a) [794]. Total length 231 millims. Greyish-white, hard, porous. The upper part 

 of the cores chiefly of coral casts, dieloria, Porites, and a piece of Lohophytum 48 millims. in length, 

 wider than the core. The lower portion of the core consists for the most part of detrital materials, with 

 Orhitolites, Textularia, Carpenteria, Polytrema, Amphistegina, and Heterostegina. Echinid spines and encrusting 

 and branching Lithothamnion. Under the microscope some of the spicules composing the Lohophytum are 

 seen to retain their brownish aspect and obscurely fibrous structure ; in others, however, the brownish 

 outer layer either merely encloses an empty mould, or the interior is filled with crystalline dolomite. 



(458a-461a). Total length 343 millims. • Greyish-white, hard, mostly porous and with irregular 

 hollows. Casts of Pocillopora, Astrsean coral, branching Madrepora, and solidly replaced Porites, with 

 undulating layers of Polytrema plaimm and Lithothamnion growing over it. Alcyonarian spicules. The 

 larger part of the cores consists of somewhat coarse-grained fragments of organisms with Orhitolites, 

 Carpenteria, Ampihistegina and Heterostegina. Echinid spines. Serpula-tuhes. Casts of lamellibranch 

 shells, some with infilled Cliona borings. 



(462a-464a). Total length 241 millims. Whitish-gi'ey, hard, minutely porous. Casts of Pocillopwa, 

 Fuiigia, about 60 millims. in diameter, branching Madrepora. Alcyonarian spicules. The larger part of 

 the cores of detrital materials, like the preceding, with Orhitolites, Polytrema plannm and Amphistegina. 

 Casts of lamellibranchs and gastropods. 



(465a, 466a). Length 430 millims. Whitish-grey, hard, partly compact, partly porous dolomite. The 

 greater part of these cores consists of specimens of Porites arenosa, in part solidly replaced by crystalline 

 materials, in part minutely porous. One specimen is 325 millims., or 13 inches in height, and wider than 



