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Fig. 
| Fig. 
Fig. 
NATURAL SCIENCES OF PHILADELPHIA. 935 
ig. 6. Zonites capnodes, W. G. B. 
a. Central and first lateral. 
6b. Marginal teeth. 
. 1. Zonites fuliginosus, Griff. 
a. Central and first lateral. 
6. Third marginal from edge of lingual membrane. 
PuaTE III. 
. 1. Zonites gularis, Say. 
a. Central and first lateral tooth. 
6. Marginal tooth. 
. 2. Zonites sculptilis, Bland. 
b. Extreme marginals. 
. 8. Zonites limatulus, Ward. 
. 4. Zonites capsella, Gould. 
. 5. Zonites Hlliotti, Redf. 
6. An extreme marginal. 
. 6. Zonites demissus, Binn. 
. 7. Zonites lasmodon, Phillips. 
ce. Last marginal but three. 
. 8. Zonites intertextus, Binn. 
. 9. Zonites internus, Say. 
5. The 16th and 17th tooth. 
e. The 25th tooth. 
10. Zonites Gundlachi, Pfr. 
6. A group of marginals. 
11. Zonites ligerus, Say. 
12. Zonites capnodes, W. G. B. 
a,b,c, d. The base of attachment. 
Vig. 
e. The reflection. 
J, f. The obsolete side cusps. 
g,g- The side cutting points. 
h. The central cusp. 
7 Central cutting point. 
PuaTeE IV. 
1. Limax flavus, Lin. 
a. Central and first lateral teeth. 
b. Marginal tooth before the bifurcation commences. 
ec. An extreme marginal, to show the bifurcation of the 
marginals. 
