SMITH : NON-MARIJfE MOLLUSCA OF GRENADA. 313 



II. GRENADA. 



Only eight species of land-sh.ells from this island were known to 

 Bland when, he published his original list in 1861.^ This number 

 he subsequently^ raised to fourteen, chiefly from the catalogue com- 

 piled by 5lr. Guppy,^ and in the following list the total is now raised 

 to twenty-five. JS^o attempt at the enumeration of the fresh-water 

 forms has previously been attempted, and even now the determination 

 of one or two of the eight species mentioned is somewhat uncertain. 



Of the land-shells, only three appear to be peculiar to the island, 

 namely, Bidimidus binomihis, Helicina Keatei, and H. Grenadensis. 

 Sixteen are common to St. Vincent, and eleven occur in Trinidad. 



The following table shows at a glance the distribution of each 

 species, those marked with an asterisk forming part of the series 

 collected by Mr. Smith. The remaining five forms not occurring in 

 the present collection are, with one exception, included in the fauna 

 on the authority of Bland and Guppy, and there appears no reason to 

 doubt the correctness of these identifications, except, perhaps, that of 

 the Veronicella, which may require re -examination. The one exception 

 referred to above, namely, Helicina occidentalism is quoted on the 

 authority of specimens in Mr. J. H. Ponsonby's collection, which he 

 received direct from his friend Mr. W. H. Lascelles, by whom they 

 were collected. Mr. Lascelles has kindly furnished a few notes on 

 some of the species, which will be quoted further on in their respective 

 places. 



In its relationship and general char3,cter, the land-fauna of Grenada 

 is very similar to that of St. Vincent, already referred to, and its 

 derivation, doubtless, in a great measure, is due to similar causes. 



In discussing the distribution of the JS^eo-tropical region, Mr. Cooke, 

 in his recent work on Mollusca, remarks that "the Antillean sub-region 

 surpasses all other districts in the world in respect of (1) extraordinary 

 abundance of species, (2) sharp definition of limits as a whole, 

 (3) extreme localization of the fauna of the separate islands." Upon 

 the third of these statements I wish to make a few remarks. It 

 certainly is not borne out by the facts ah-eady cited above in 

 connection with the fauna of St. Vincent and Grenada. When we 

 find in the case of the -former island that only three out of the 

 thirty-one terrestrial species are peculiar, and that only three out 

 of twenty-five occur in the latter which are not found elsewhere, the 

 inaccuracy of Mr. Cooke's statement becomes apparent. That it may, 

 to a certain extent, be applicable as regards some of the larger islands 

 is very possible, but in the cases I have cited and also as regards 

 Barbados the remark cannot be substantiated. In none of these 

 islands, the molluscs of which have been studied by the writer, does 

 "extreme localization of the fauna" occur. 



1 Ann. Lyceum Nat. Hist. New York, vol. vii, p. 354. 



2 Amer. Journ. Conch., vol. iv, pp. 187-9. 



3 Ann. Mag. Nat. Hist. 1868, vol. i, pp. 435-7. 



