OF THE DUTCH WEST-INDIAN ISLANDS. 185 
As regards the distribution of the species, recorded from 
St. Martin, as shown in the above Table, this island seems 
to occupy an intermediate position between the islands of 
section IV and those of section V a. It has 29 species and 
varieties in common with islands of both section IV and 
V a, moreover 14 species in common with islands of section 
V a alone, and only 5 species in common with other islands 
of section IV alone; of the latter one species is also occurring 
in St. Vincent and in Florida, and one in Trinidad, Mexico 
and Florida. Thus St. Martin seems to be even more allied 
with the islands of section V a, than with those of section LV. 
Can the great number of species common to St. Martin 
and Guadeloupe, 41, perhaps be attributed to the fact that 
both islands (St. Martin only partly) are belonging to the 
same European power, and consequently may have an 
increased intercourse ? 
From the five molluses, recorded from St. Eustatius, the 
three Opeas species are widely distributed, and Drymaeus 
elongatus is recorded from many of the West-Indian islands; 
the fifth species, Bulimulus diaphanus, is common to this 
island and to Saba, St. Thomas, Vieques, Portorico and 
Barbados. 
As concerns its other molluscs, besides the not further 
indicated Stenogyrae, Saba shares with some other islands 
of section Va: Amphibulima patula, with Haiti, Portorico 
and St. Croix: Succinea riisei, and with many islands of 
section IV and section V «, and also with Trinidad: Helicina 
fasciata. 
From a geographical point of view the molluscan fauna 
of the other group of islands is more interesting. A priori 
one should expect that the molluses of Curacao and neigh- 
bouring islands, owing to the vicinity of the South-American 
continent, should be closely allied with those of Venezuela. 
A study of the molluses, recorded till now from those 
islands, informs us however that such a near relation between 
the molluscan faunas of the Curacao-group and Venezuela 
does not exist. Only seven of the 25 species, recorded from 
the three islands together, are also occurring in Venezuela 
Notes from the Leyden Museum, Vol. XXXVI. 
