REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 285 



same as those last noted ; Halimeda only occurs sparsely. CUona borings are 



present. 



Details. 



(565a). Length 313 millims. Greyish-white, minutely porous, with some irregular hollows. Coral casts 

 present throughout. Prionastrcra niagnifica; conical or cylindrical corals, growing either singly or in small 

 clumps, Madrefwa, Alontipora and Porifes (1). Alcyonarian spicules. OrhUolitea, Pohjtrrma plannm, AmpJmtegwa. 

 Casts of lamellibranchs and gastropods. Fragments of LHhofhamninn. 



(566a, 567a). Total length 265 millims. Greyish- white, porous. Casts of PoriUnpora, simple cylindrical 

 Astraean, Jfadrqmra, J'orifes. Alcyonarian spicules. Greater part of core consists of detrital materials with 

 Orhitolites, common, Carpenferia, Amphistegina. Eehinid spines. Casts of lamellibranchs and gastropods. 

 Lithothamniov. 



(568a). Length 294: millims. Greyish-white, porous, with irregular hollows. Largely of coral casts, 

 PocAllopora, Orhicella, cylindrical Astraean, Madrepora, Porifes common. Alcyonarian spicules. Detrital 

 fragments with the same genera of foraminifera and other organisms as in the preceding. Infilled CUona 

 borings. 



(569a, 570a). Total length 363 millims. Greyish-brown, compact to minutely porous, efflorescent in 

 places. Chiefly of corals. PoriUopora, Coeloria, Astraean, Madrepora, Poritca common, and Adrceopora. 

 Millepora, alcyonarian spicules. Carpenieria, Amplmtegina ; casts of lamellibranchs and gastropods ; 

 branching Lithothamnion. 



(571a, 572a). Total length 303 millims. Greyish-white, porous, and cavernous. Cores chiefly of corals, 

 Pocillopoi-a, Cceloria, Orhicella pleiades, and Madrepora. Millepwa, mass of Loboph//ium, and detached spicules. 

 Polytrema planum and A mplmtegina. Eehinid spines. Casts of gastropods. Bra.nchmg Lit Jwf ham nion. 



(573a-575a) [808]. Total length 151 millims. Greyish-white, porous. Largely of coral casts. 

 Pocillopora, Orhicella pleiadex, ]\[ailrepwa and Asfrcopora. Millepora, alcyonarian spicules. Orhitolites, 

 Carpetiteria, Gijjmna, Amphistegina, &iid Ileterostegina ; eehinid spines. Cliona borings. Lithothamnion. A 

 microscopic section of the Astrceopwa shows that the coral structure has been replaced by crystalline 

 dolomite, while the original interspaces are now either infilled with consolidated sediment or are merely 

 lined with crj^stals. 



(576a) [809]. Length 316 millims. Greyish-brown, speckled, minutely porous, hardly any hollows. 

 One or two examples of Pocillopora and Orhicella j^leiades : the rock, excepting these coral casts, is throughout 

 of minute organic fragments with Orhitolites, common, Carpenteria, Cal carina, Gijpsina vesicular is, Poli/frema 

 miniaceum, Amphistegina, and Heterostegina, common. Eehinid spines. Casts of gastropods. Halinieda and 

 fragments of Lithothamnion. Many of the small irregular detrital fragments are now without structure, 

 being replaced by crystalline dolomite ; it is possil^le that they are altered pieces of corals. The fragments 

 are cemented into hard rock by crystalline dolomite. 



(577a, 578a) [810]. Total length 248 millims. Greyish-white, speckled, minutely porous. Numerous coral 

 casts ; Pocillopjora, Ccdoria, Astrcea, Orhicella pleiades, and 3Iadrep07u contecta. Alcyonarian spicules. 

 Somewhat coarse fragmental materials with Orhitolites, Carpjenteria, Gijpsina, Pohjtreumpjlanum, Amphistegina, 

 and Heterostegina. Eehinid spines. Fragments of LJthothnmnion. 



(579a-582a) [600]. Total length 298 millims. Greyish-white to greyish-broAvn, compact to porous. Largely 

 of corals belonging to Sti/lophora, Pocillopora, and Ccdoria. Somewhat coarse detrital materials containing the 

 same foraminifera and other organisms as in the preceding core. 



(583Aj). Length 127 millims. Greyish-brown, minutely porous, with a large hollow extending the 

 length of the core, where part of a large specimen of Orhicella has been removed. About half the core 

 consists of detrital materials with Orhitolites, Polytrema planum, and Amphistegina. Eehinid spines. 

 Halimeda, Lithothamnion. 



