\ 
| 
} 
Fig. 6 
Fig. 7 
Fig. 8 
Fig. 9 
Fig. 10. 
io. 1 
ios 2 
Migr 3 
Fig. 4 
Fig. 5 
Fig. 6 
Fig. 7 
Fig. 8 
Rhionn 9 
Fig. 10 
Bie. 1 I. 
Fig. 12. 
Fig. 1 
Fig. 2 
Fig. 3 
Fig. 4 
Bios, 
Fig. 6 
ies) 7 
Fig. 8 
ies 9 
Fig. 10 
Fig. 11 
Fig. 12 
Fig. 13 
Fig. 14 
NATURAL SCIENCES OF PHILADELPHIA. 
. Helix Ayresiana, Newe. 
. Helix redimita, W. G. B. 
. Helix Nickliniana, Lea. 
. Helix ramentosa, Gld. 
8. The eighth tooth—an outer lateral. 
Helix exarata, Pfr. 
PLATE XV. 
a. Central and lateral teeth. 
b. Inner marginal tooth. 
ce. Outer marginal tooth. 
. Macroceramus Gossei, Pfr. 
. Pupa rupicola, Say. 
. Succinea avara, Say. 
. Succinea obliqua, Say. 
. Stenogyra decollata, Lin. 
. Succinea effusa, Shuttl. 
. Bulimulus dealbatus, Say. 
. Stenogyra subula, Pfr. 
. Cecilianella subcylindrica, Lin. 
. Succinea campestris, Say. 
Succinea lineata, W. G. B. 
Pupa fallax, Say. 
PuatTt XVI. 
Jaw of:— 
. Stenogyra subula, Pfr. 
. Arion hortensis, Fér. 
. Vitrina limpida, Gld. 
. Helix Newberryana, W. G. B. 
. Ferussacia subcylindrica, L. 
. Hemphillia glandulosa, Bl. and Binn. 
. Pupa rupicola, Say. 
. Helix aspersa, Mull. 
. Prophysaon Hemphilli, Bl. and Binn. 
. Helix Yatesi, J. G. Cooper. 
. Helix polygyrella, Bl. and J. G. Coop. 
. Bulimulus sufflatus, Gld. 
. Orthalicus undatus, Brug. 
. Helix griseola, Pfr. 
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