OF CONCHOLOGY. 177 



TV. )lo4. IS^^S- 



NOTES ON THE LAND-SHELLS OP TRINIDAD, GRENADA 

 AND DOMINICA, AND ALSO OP CURA9AO AND BUEN 

 AYRE, W. I. 



BY THOMAS BLAND. 



Since the publication of my Catalogue of Land-Shells of the 

 West Indies, (Ann. Lye, vii, 1861) our knowledge of the faunas 

 of Trinidad, Grenada and Dominica has been greatly extended 

 by Mr. R. J. Lechmere Guppy, with whom I have the pleasure 

 of corresponding, and to whose liberality I am indebted for nu- 

 merous spe-cimens. 



Guppy made known the results of his labors in the Annals 

 and Magazine of Natural History (1864, 1866 and 1868), and 

 in the Proceedings of the Scientific Association of Trinidad, 

 (1866, 1867). Considering some of his determinations erroneous, 

 it seems to me desirable that my notes should be published, es- 

 pecially as correct conclusions regarding the species have an im- 

 portant bearing on the question of geographical distribution. I 

 am moreover glad to make more generally known the very valu- 

 able data which Mr. Guppy has collected. 



In former papers on the geographical distribution of species 

 in America and the West Indies (Annals of the Lyceum, 1. c, 

 and American Journal of Conchology, ii, 1866), I remarked on 

 the connection of those continental and insular faunas, and 

 showed conclusively the closer relations of the sub-provinces em- 

 bracing Cuba, Jamaica and Hayti with North America, and of the 

 Porto Rico and Guadeloupe sub-provinces (Trinidad, Grenada 

 and Dominica being included in the last), the latter especially, 

 with South America, and the discoveries of Guppy give further 

 evidence in support of my views. 



Guppy justly remarks with respect to the molluscan fauna of 

 Dominica, that its general aspect " is precisely what we might 

 have expected from its position between the islands^ of Guade- 

 loupe and Martinique." 



The occurrence of a species of CyclofhoruB in Dominica is very 



