Pe ean gE ID: gh Xs 
ADDITIONS AND CORRECTIONS. 
Wor. I: 
Geographical Distribution of the Mollusca. 
Mr. Thomas Bland, of New York, who is so well acquainted 
with the distribution of the land shells of the West Indies, has 
kindly sent me the following notes and corrections : 
[P.180.] Helix similaris, Fer , has been found in Barbados 
only, of the West India Islands ; an accidental introduction, no 
doubt, as coffee is not cultivated there. It is not found in 
Jamaica, Hayti or Porto Rico, in all of which coffee is cultivated. 
[P.198.] Peruvian Region. The occurrence of Cyane (Pros- 
erpinacea) is remarkable. 
[P. 201.] Caribbean Region. In the faunal grouping of the 
islands Turk’s Islands should go with the (1) Bahamas ; and with 
(4) Hayti and Navassa,the important island of Gonave, in which 
there are 21 species—9 peculiar. 
The Virgin Islands and St. Barts are to be added to the fifth 
group: but south of a line drawn to the north of Saba and Bar- 
buda, the fauna changes remarkably. South of that line Macro- 
ceramus and Strophia disappear; Cylindrella is represented by 
two or three species only. Important operculate genera also 
are absent, Tudora, Cistula, ete. 
Group 7. Barbados is peculiar; the Cyclostome not repre- 
sented; Streptaxis found there (as well as in Trinidad), and also 
Bulimus (Borus) oblongus. 
Group 8. Windward Islands, Curacao and Buen Ayre. ‘The 
islands from and including Guadeloupe to Grenada are called 
the Windward Islands; Trinidad and Tobago should go together 
as a separate group; and again, as another group, Aruba. 
Curagao and Buen Ayre. 
The grouping somewhat corresponds with the depth of the 
surrounding water; with some curious exceptions: between 
St. Thomas and St. Crcix the depth is 1570 fathoms; nearly 100u 
fathoms between Martinique and St. Lucia; between St. Vincent 
and Barbados, 1493 fathoms. 
Bahamas and Turk’s Is. [p. 201]. The number of species 
