Oy THE OEOLOOr OP BARBADOS, 225 



The following is an analysis of a curious brownish crystalline 

 concretionary rock obtained by ^Ir. Easton from a shaft at Cane 

 Garden. If not a pure infiltration-product occupying a cavity, it 

 must be a highly altered coral-rock with much infiltrated material. 

 It was analysed because it somewhat resembled a dolomite, but the 

 amount of magnesia proved to be small : — 



Calcium carbonate 84-89 



Magnesium carbonate 1-48 



Calcium phosphate -04 



Iron and alumina 2-24 



Silica and clay 9-43 



Loss on ignition 2*01 



100-14 



§ 5. PALiEONTOLOGY AND CoNSIDEEATION OP THE AgB OP THE 



Raised Reefs. 



We were not able to make a large collection of fossils from the 

 raised reefs, but such as we did obtain have been examined by 

 Messrs. J. W. Gregory and E. A. Smith, of the British Museum 

 (Natural History); the species they have been able to identify 

 afford strong evidence that the whole series of reefs from the lowest 

 to the highest are of recent geological age, and that none of them 

 date back to a time that was anterior to the establishment of the 

 present West-Indian fauna, though the coral fauna includes a few 

 forms which are not yet known to exist in the Caribbean Sea. 



The following is a list of the mollusca obtained from the coral 

 rock in the neighbourhood of Ceres and Pairfield, north of Bridge- 

 town, at levels of from 70 to 90 feet above the sea. The specimens 

 were examined and named by Mr. E. A. Smith. 



Lamellibranchiata. 

 Lucina columbella. 



do. jamaicends. 



do. (I) i varicella) dentaia. 



do. {CodaJcia) costata. 

 Capsa d"Jiorata. 

 Barbatia, sp. 



Tcllina ephippium, 



do. decora, 



do. interrupta ? 



do. sp. 



do. sp. 

 Cardium, sp. 



OliveUa jaspidea. 

 Mitra harhadcnsis. 

 Cyprcsa apurca. 

 Pollinices porcellanea. 

 Natica marocana. 

 Obeliscus dolohratus. 

 Columbella mercatoria. 

 Ceritkium afratum. 



do. litterafum. 



do. cburneiim. 

 Murex messorius. 



Gasteropoda. 



Coralliopkila ? 

 Sistrum nodulositm, 

 Littorina ahena. 

 Leitcogonia cingulifera. 



do. Tar. angularis, Reeve, 

 Fissurclla reticulata. 

 Hipponyx antiquatus. 

 Patella, sp. 

 Bulla striata. 

 Helix, sp. 



Besides these, the large West-Indian Stromhus gigas and Cassis 

 flammea were not uncommon. 



