242, PROCEEDINGS OF THE ACADEMY OF 
PriatTe XVII. 
Central, lateral, and outer marginal teeth of :— 
Fie. 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. 
Fig. 7. Zonites nitidus, Mull. 
Fig. 8. Zonites milium, Morse. 
Fig. 9. Zonites ferreus, Morse. 
Fig. 10. Veronicella Floridana, Binn. 
Fig. 11. Succinea Sillimani, Bland. 
Puate 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. 38. Helix Pennsylvanica, Green. 
Fig. 4. Helix loricata, Gld. 
Fig. 5. Helix Mitchelliana, Lea. 
Fig. 6. Helix pulchella, Mull. 
Fig. 7. Helix labyrinthica, Say. 
Fig. 8. Helix Townsendiana, Lea. 
Fig. 9. Helix asteriscus, Morse. 
Fig. 10. Helix obstricta, Say. 
Notrrt.—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. 146, line 11, for former read latter. 
p. 147, line 20, for Anaderus read Anadenius. 
p. 148, line 12, for Szmpulopsus read Simpulopsis. 
p. 153, line 17 from bottom of right hand column, for Terussacia read Ferussacia. 
line 16, for Cascilianella read Ceecilianella ; also on p. 186. 
p. 154, line 11 of left hand column, for Columbianaus read Columbianus. 
p. 155, note, for ptychoptora read ptycophora. 
