242 PROCEEDINGS OF THE ACADEMY OF 



Plate XYII. 

 Central, lateral, and outer marginal teeth of: 

 Fio-. 1. Zonites multidentatus, Binn. 

 Fig. 2. Zonites suppressus, Say. 

 Fig. 3. Zonites indentatus, Say. 

 Fig. 4. Zonites arboreus, Say. 

 Fig. 5. Zonites fulvus, Drap. 

 Fig. 6. Zonites viridulus, Mke. 

 Fia. 7. Zonites nitidns, Miill. 

 Fig. 8. Zonites milium, Morse. 

 Fig. 9. Zonites ferreus, Morse. 

 Fie;. 10. Veronicella Floridana, Binn. 

 Fig. 11. Succinea Sillimani, Bland. 



Plate XVIII. 



a. Central and lateral teeth. 



b. Transition from laterals to marginals. 



c. Inner marginal teeth. 



d. Outer marginal teeth. 

 Fig. 1. Helix Wheatleyi, Bland. 

 Fig. 2. Helix thyroides, Say. 



Fig. 3. Helix Pennsylvanica, Green. 



Fig. 4. Helix loricata, Grid. 



Fig. 5. Helix Mitchelliana, Lea. 



Fig. 6. Helix pulchella, Miill. 



Fig. t. Helix labyrinthica, Say. 



Fig. 8. Helix Townsendiana, Lea. 



Fig. 9. Helix asteriscus, Morse. 



Fig. 10. Helix obstricta, Say. 



Note. The following typographical errors in the earlier pages of this 

 paper should be carefully corrected : 



p. 141, third line from bottom, for Paluta read Patula. 



p. 14G, line 11, for former read latter. 



p. 147, line 20, for A?utderus read Anadenus. 



p. 148, line 12, for Simpulopsus read Siinpulopsis. 



p. 153, line 17 from bottom of right hand column, for Terussacia read Ferussacia. 



line 16, for Cnocilianella read Coecilianella ; also on p. 186. 

 p. 154, line 11 of left hand column, for Columbianaus read Columbianus. 

 p. 155, note, for ptychoptora read ptycophora. 



