578 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 20, 



that some of the MoUusca are identified with European Eocene spe- 

 cies, it is obvious that we cannot consider our knowledge of the 

 Tertiaries of Guadeloupe at all exact. InDuchassaing's list eight 

 corals are mentioned. Dr. Duncan has also treated of the fossil 

 corals of Guadeloupe*. 



Duchassaing refers centain deposits to the Miocene. Erom the 

 lower volcanic sands, which he includes in this formation, he only 

 gives us the names of two Mollusca, one of which he considers to be 

 identical with a Paris-basin species, and the other occurs in his 

 Older Pliocene. According to Moreau de Jonnesf, the Miocene 

 formation includes Terehratidce like those of more ancient strata. If 

 this is the case, it may be the equivalent of the San Eernando beds 

 in Trinidad. 



M. Payen found fossils in Guadeloupe referable to Cyprcea, Tere- 

 hratida, Spatcmgus, and Echinus. Deshayes considered these to be 

 Quaternary, and the Terehratula to belong to a new species J. 



In Trinidad, beneath a large unfossiliferous detritai series, there 

 exists a Phocene formation, exposed at Matura on the east coast, 

 from which I have already published a list of species §. Many of 

 my determinations were doubtless erroneous ; but to provide for 

 mistakes of this kind I affixed marks to such of the species as I had 

 compared and found identical with recent forms. I see no ground 

 for changing my opinion as to the relative age of these beds, although 

 it is probable that the percentage of extinct species is somewhat 

 greater than stated. 



The greater part of the island of Barbados appears to consist of 

 Tertiary rocks which have been divided into two main divisions. 

 The newest of these, the coral-limestone, contains a large number of 

 recent species. IN'o extinct species of Mollusca are recorded from it. 

 The Scotland formation is considered to be older, and the following 

 shells have been described from it|| : — 



Scalaria Ehrenbergi, Forbes. I Nucula Schomburgki, Forbes. 

 Nucula Packeri, Forbes, \ 



This formation was considered to be Miocene by Professor Eorbes ; 

 and it seems to include the deposits containing siliceous organisms^. 

 Dr. Duncan has described, in his paper before cited, three species of 

 corals from Barbados. 



Barbuda contains a formation resembling the coral-limestone of 

 Barbados. It consists of a white calcareous deposit full of shells, all 

 of which are, as far as I have examined, of existing species. The 

 existence of a Miocene formation in that island seems, nevertheless, 

 to be indicated by the corals described by Dr. Duncan. That palae- 

 ontologist has also described corals from Montserrat &c. 



* Quart. Jo urn. Geol. Soc. vol. xix. pp. 412, 452. 



t Cited by Duchassaing, Bull. Soc. Geol. France, ser. 2. vol. iv. p. 1093. 

 X Bull. Soc. Geol. de France, ser. 2. vol. xx. (1863) p. 475. 

 § Geological Magazine, vol. ii. (1865) p. 256. 

 II Schomburgk, History of Barbados, p. 565. 



^ Ehrenberg's account of these fossils vras partly translated in Ann. Nat. Hist, 

 vol. XX. p. 115. 



