286 DR. J. AV. GREGORY ON THE PALAEONTOLOGY [Aug 



III. List of Mollusca prom the Low-level Reefs of 

 Barbados. 



In consideration of the differences between the corals of the raised 

 reefs of Barbados and those still living in adjoining seas, it seemed 

 advisable to examine the fossil mollusca. Mr. Jukes-Browne made 

 a collection for this purpose from some reefs at Ceres, at the height 

 of about 70 feet above the sea ; a list of these was published in 

 189 1. 1 The collection, however, was a comparatively small one, 

 numbering only twenty-seven species. Since then the opportunity for 

 a careful comparison between the recent and fossil molluscan faunas 

 has been afforded by the kindness of the Bt. Bev. Bishop Mitchinson, 

 who, during his residence in Barbados, made a large collection of 

 shells from the raised reefs near Bridgetown. This collection, 

 numbering over 1000 specimens belonging to over 140 species, he 

 has generously presented to the British Museum (Nat. Hist.). That 

 it has been possible to work out the collection is due to the kindness 

 of Mr. E. A. Smith ; he has himself named most of the species and 

 checked every doubtful determination, often by comparison with 

 D'Orbigny's types, which are now preserved in the Zoological 

 Department of the Museum. For the amount of trouble which 

 Mr. Smith has taken in this work I must express to him my best 

 thanks. 



The list is arranged in accordance with the classification adopted in 

 Fischer's ' Manuel de Conchologie.' Many of the names are probably 

 not of specific value ; they have been given only to West Indian varieties 

 of more widely distributed species. As the list is, however, mainly 

 useful for the study of distribution, these slight differences are 

 of value. The distribution is taken in the main from the works of 

 Paetel and E. A. Smith. In deference to the opinion of the latter, 

 Tryon's localities and some mistaken records in Paetel have been 

 omitted. 



A list of 53 species was published by Sir B. Schomburgk, 2 but the 

 exact horizons from which these came are not stated. 



1 A. J. Jukes-Browne & J. B. Harrison, ' The Coral Bocks of Barbados 

 and other West Indian Islands,' Quart. Journ. Greol. Soc. vol. xlvii. (1891) 

 p. 225. 



2 B. H. Schomburgk, ' History of Barbados,' 1847, pp. 562-565. 



