APPENDIX 



Additions and Corrections. 



YOL. 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, Hay ti or Porto Rico, in all of which coffee is cultivated. 



[P. 198.] Peruvian Region. The occurrence of Cyane (Pros- 

 erpinacea) is remarkable. 



[P. 201.] Caribbaean 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 Yirgin Islands and St. Barts ai'e to be added to the fifth 

 group : but south of a line drawn to the north of Saba and Bar- 

 buda, the fauna changes remarkabl}'. South of that line Macro- 

 ceramus and Strophia disappear ; Cylindrella is I'epresented by 

 two or three species only. Important operculate genera also 

 are absent, Tudora, Cistiila, etc. 



Group 7. Barbados is peculiar ; the Cyclostomae not repre- 

 sented ; Streptaxis found there (as well as in Trinidad), and also 

 Bulimus (Borus) oblongus. 



Group 8, Windward Islands, Cura9ao 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. 

 Cura9ao and Buen Ayre. 



The grouping somewhat corresponds with the depth of the 

 surrounding water ; with some curious exceptions : between 

 St. Thomas and St. Croix the depth is 1.570 fathoms ; nearly lOOU 

 fathoms between Martinique and St. Lucia ; between St. Yincent 

 and Barbados, 1493 fathoms. 



Bahamas and Turk^s Is. [p. 201]. The number of species 



