A. E. Verrill — The Bermuda Islands. 



729 



Polygyra microdonta (Desh.) ; Bahamas. Fig. 72. 

 Zonitoides minusculns Bin. ; Greater Antilles ; whole United 

 States. Fig. 71. 



Papa (Bifidaria) servilis Gld.= pellucida Prime; Cuba; Bahamas. 



Fig. 74a. 

 66 



Figure 66. — Pedipes tridens ; x 15. Figures 70, a, b. — Thysanophora vortex; 

 x 3. Figure 71. — Zonitoides minusculus; x 4. Figure 72. — Polygyra micro- 

 donta; x3. 66, 70, 72, by A. H. V.- 71, by E. S. Morse. 



Pupa [Bifidaria) Jamaiee)isis Adams ; Jamaica. Fig. lib. 



Pupa [Bifidaria) rupicola Say ; Cuba ; Florida. Fig. 74c. 



Pupoides marginatits (Say) ; Greater Antilles ; United States. 

 Fig. 73. 



Perhaps some of the other common species, as Helicella ventricosa 

 and the Succinea, should be added to this list. 



74 74 



80 



Figure 73. — Pupoides marginatum; x 6%. Figure 74a.— Pupa servilis; x 9. 

 Figure 746. — Pupa jamaicensis ; x 9. Figure 74c. — Pupa rupicola; x 9: 

 Figures 80, a, b. — Succinea Barbadensis; x 3. 



But much the larger numbers of slu^s and snails are believed to 

 have been introduced in rather modern times by means of commerce, 

 and more especially in connection with the introduction of growing 

 plants, for the eggs and young might easily be introduced in large 

 numbers in the earth with potted plants, or in that adherent to the 

 roots of trees and shrubs. The dates of introduction of some of 

 these are pretty accurately known, and in some cases they are quite 

 modern ; others are very uncertain. 



