JOURNAL OF CONCHOLOGY. 
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Ww CISt OF THE LAND AND FRESELWATER 
MOLILUSCR. “Ol IM RIUN TODA) 
By EDGAR A. SMITH. 
(Read before the Conchological Society, Dec. 4th, 1895). 
Lists of the molluscan fauna of Trinidad having been 
published as recently as r8go* and 1893}, it might appear that 
another catalogue was scarcely necessary. So many species, 
however, in the lists referred to, required alteration in their 
nomenclature, that it was deemed advisable to publish a revi- 
sion of the whole. The same sequence and numbers of the 
species are adopted as appear in Mr. Guppy’s catalogue. 
Alterations have been made in the generic or specific names 
of more than half the species, four new forms have been 
described, and two others are recorded which do not appear in 
Mr. Guppy’s list. No attempt has been made to give references 
in every case, as this has already been done by M. Crosse. 
An examination of the following table will show that some 
of the deductions with regard to the geographical distribution of 
the species, which appear in the report by the latter author, are 
no longer tenable. he increase of our knowledge, with respect 
to the identity of many of the species and the extension of their 
range, shows that the proportion of indigenous species is con- 
siderably less than was supposed. Of the twenty-two species 
cited by M. Crosse, only thirteen are now regarded as restricted 
to the island, and even several of these will probably be found 
elsewhere by future collectors. 
To the twenty-eight species mentioned as living both in 
Trinidad and on the American continent, seven additional forms 
are quoted in the present paper. Of the eight species mentioned 
by Crosse as occurring on the mainland and Trinidad, but not 
on any of the other West Indian islands, one, Guppya vacans 
* Crosse, Journ. de Conch., 1890, pp. 35-65. 
{ Journ. of Conch, vol. vii., pp. 210-231. 
