GUPPY — MOLLUSCA OF TRINIDAD. 
135 
Tuesday the 9 th April , 1867. 
Alexander Williams Anderson, Esq., in the Chair. 
The following donation was announced : 
“ Notes on the Natural History of the Scorpion,” by the 
Hon. Hichard Hill ; and “ Remarks on some species of 
West-Indian Marine Shells in the Cabinet of Amherst 
College, Mass.,” by Henry Krebs. Presented by Henry 
Krebs, Esq., of St. Thomas. 
The following communication was read : 
Additions to the Catalogue of the Land and Freshivater 
Mollusca of Trinidad . 
By R. J. Lechmere Guppy, Esq., E.G.S., E.L.S. 
Since the publication of my Catalogue of Land and Fresh- 
water Mollusca in the last number of the Proceedings of the 
Association I have discovered other species previously un- 
known to me, some of which I believe to be new to science. 
One of these is a land-shell of small size but peculiar struc- 
ture, and another is a freshwater bivalve belonging to a 
group not hitherto found in the island. I have given diag- 
noses and figures of these species in the Annals of Natural 
History for the present year, and now communicate their 
names and most prominent characters. 
Besides the shells now enumerated I have discovered three 
inopereulata, all of small size, but which are as yet undeter- 
mined. I trust to make them the subject of a future paper. 
Class GASTEROPODA. 
Sub-class Prosobranchiata. 
Order Phaneropneumona. 
Diplomatina Benson 1849. 
Terrestrial Operculata with pupiform scarcely rimate 
shells having a nearly circular aperture, an expanded or 
