1 873.] DUNCAN— WEST -INDIA TEETIARY. 549 



overlying the Hippurite limestone in Jamaica were small, stunted, 

 and indifferently grown ; but those now under consideration are 

 large, numerous, and indicate the former existence of all the physical 

 conditions peculiar to coral-reefs. 



Influenced by these considerations, I thought that another essay 

 on the subject which has so frequently been brought before you 

 would still be interesting. 



Strata which could be correlated with European Eocene deposits 

 were discovered by Mr. Lucas Barrett when surveying Jamaica. He 

 found some conglomerates in one part of the island, and dark shales 

 and sandstones in others, overlying the Cretaceous formation, and 

 covered by deposits which had been determined to be of Miocene 

 age ; but the palseontological evidence was deficient. 



In 1864 Mr. Wall and myself contributed to this Society the paper 

 already noticed ; it contained his description of the stratigraphical 

 succession, and my notice of the Madreporaria. These had the facies 

 of the older Tertiary deposits of the Old "World ; and the specimens 

 recalled the puny development of the corals of the London Clay and 

 Bracklesham deposits. 



The notice of the Madreporaria was summed up as follows : — 

 " The Eocene shales and dark-coloured sands which represent the 

 conglomerate in some localities, or which constitute its upper part 

 in others, yield corals in no very great number. The specimens from 

 Port Maria are either dark and carbonaceous-looking, or are contained 

 in a fine dark purple conglomerate. All are very significant of the ho- 

 rizon, and recall the puny development of the species of the London 

 Clay. The Paracyathus from Yallahs Valley resembles that of the 

 London Clay, being even stained black, like the Sheppey specimens. 

 The SStylocoenia emarciata, Ed. & H., is a well-known form in British, 

 French, Italian, and Sindhian early Tertiary collections, and the 

 Stylophora contorta, Leymerie, also. The Stylocoenia eaidiStylophora 

 are characteristic corals, and denote an Eocene horizon ; and they 

 indicate, when unaccompanied by other species, the existence of 

 physical conditions not favourable for coral-growth." 



In 1867 I added Columnastrcea Eyrei, nobis, to the Eocene coral- 

 fauna of Jamaica. 



Mr. It. J. Lechmere Guppy, F.G.S., in 1866, suggested that the 

 San-Fernando beds might belong to a formation of older date than 

 the superincumbent Miocene strata. They were evidently younger 

 than the Cretaceous formation ; and their Brachiopoda presented a 

 facies which might be considered either Tertiary or Cretaceous. 

 Still no characteristic Eocene species was discovered in Trinidad. 



Nevertheless Mr. Cuppy's sagacious idea has borne good results ; 

 for Mr. Cleve found the San-Fernando Echinolampas ovum-serpentis, 

 Guppy, and lianina porifera, Woodw., in some strata in the Island of 

 St. Bartholomew. 



These strata have yielded the fossils about to be described, and 

 which belong to a pre-Miocene fauna. Moreover Mr. Cleve has 

 found in them many specimens of a large Nerita allied to Neritcc 

 conoidea, Lmk., and also Cerithium giganteum, Lamk. 



