729 A. EF. Verrill—The Bermuda Islands. BT 
Polygyra microdonta (Desh.) ; Bahamas. Fig. 72. 
Zonitoides minusculus Bin.; Greater Antilles; whole United 
States. Fig. 71. 
Pupa (Bifidaria) servilis Gld.= pellucida Prime; Cuba; Bahamas. 
Fig. 74a. 
Figure 66.—Pedipes tridens; x15. Figures 70, a, b.—Thysanophora vortec ; 
x8. Figure 71.—Zonitoides minusculus; x4. Figure 72.—Polygyra micro- 
donta; x3. 66, 70, 72, by A. H. V.; 71, by E. S. Morse. 
Pupa (Bifidaria) Jamaicensis Adams ; Jamaica. Fig. 746. 
Pupa (Bifidaria) rupicola Say ; Cuba; Florida. Fig. 74e. 
Pupoides marginatus (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. 
Figure 73.—Pupoides marginatus; x 61g. Figure 74a.—Pupa servilis; x 9. 
Figure 74b.—Pupa jamaicensis; x 9. Figure 74c.—Pupa rupicola; x 9. 
Figures 80, a, b.—Succinea Barbadensis; x 3. 
But much the larger numbers of slugs 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. 
