290 DE. G. J. HINDE. 



hollows. With the exception of one or two casts of Sii/lophora and OrhireUa, the cores are chief!}' 

 foraminiferal and detrital. The same foraminifera as in the preceding core, except Carpenteria and 

 Calcarino,, which were not noticed. Si'rpiiJa-i\\hQ&. Cliona borings. Encrusting and nodular Lithothamnion. 

 (626a, 627a). Total length .3.56 millims. CTreyish-l)rown, flecked with white, for the most part compact 

 and crystalline. There are some casts of PociUoponi, .simple Astrtean and perforate cora's, too poorly 

 preserved for identification, in the lower core, but the larger part of the rock consists of foraminifera and 

 detrital organic fragments. Orbifolifes and Ampilmtvijina are very numerous ; Gi/pgina, Poli/ircma, and 

 Hderostegina are also plentiful. Casts of gastropods. 



Depth from Surface, 106G-107o feet ; Distance Bored, 9 feet ; Total Length of Core 

 Obtained, 7 feet 9 inches; Numhers of Cores, 628a-643a. 



Solid cylindrical cores of greyish-brown, hard, generally compact, dense and 

 crystalline, dolomitic limestone. With few exceptions the rock is somewhat poor in 

 corals, this may in part arise from their having been removed or replaced by 

 crystalline dolomite ; those that remain are frequently so indistinctly 'preserved that 

 it is not practicable to determine the genus to which they belong. As a rule, the 

 corals are only small casts of StyJophora and PocdJopora, ^vith larger' sjiecimens of 

 OrhiceUa ; there is also an examjjle of EvpliylUa or an allied genus in one of the lower 

 cores, the first form of this group which has been met with. Perforate corals are not 

 uncommon, but except Madrepora they cannot be recognised. Millepoi'a is not 

 infrequent, and alcyonarian spicules are very numerous throughout these cores. The 

 great mass of the rock consists of foraminifera and other detached organisms and 

 fragments which are cemented into solid i-ock ])y crystalline dolomite. The 

 foraminifera are of the usual types : Orhitolites, Tcvtvlaria, Carpenteria, Gypsina, 

 Polytrema, Amphistegina, Ileterostegina, and one imperfect specimen is considered by 

 Mr. Cbapman to be a Cycloc/ypcns. Echinid K[)ines. LithotJtantnion,, encrusting and 

 in nodules. 



1)ktaii>s. 



(628a). Length 3-57 millims. (4reyish-l)iowii, compact to minutely porous, with occasional hollows 

 where corals have been dissolved out. This core consists chiefly of corals, belonging to Sti/lopkora, 

 Pocilhpora, a specimen of Orhlirlla /th-iin/r's, 160 millims. in height, simple A strajan, Mtubrpora (1) And other 

 perforate corals. Milli-jiom, also alcyonai'ian spicules. The foraminifera include Orhitolifr^, Textnlaria, 

 Gypsina, Poli/tinna, and .liii/)hisf''i/ina. Echinid spines. Lifhofliainnion. 



(629a) [820]. Length 11."^ millims. Greyish-brown, crystalline dolomite, similar to the preceding. 

 The rock is almost wholly foraminiferal and fragmental, and the organisms ar'e similar to those in the 

 preceding core, with the exception that Ti'.iitihiiia does not occur, whilst fragments of Carpenteria are 

 present. Alcyonarian sjjiculcs. 



(6.30a). Length 2L5 millims. Greyish-brown, compact to minutely porous. Casts of I'orillopora, simple 

 Astrapan, and fragments of perforate corals. Alcyonarian spicules abundant. Greater part of core 

 foraminiferal and detrital, with OrhifoUfef, J'oh/fre/iid, Amphii<tegina, and Ileferoxfef/ina. PVagments of 

 Idthofhiiimiiov. 



(631a~633a). Total length 276 millims. Rock similar to preceding. Casts of FociUopora and of 

 perforate corals, which are now I'eplaced and infilled with the crystalline dolomite. Alcyonarian spicules, 

 foraminifera, and LUhothainnion as in the preceding core. 



