EXPLANATION OF PLATE XXVI. 
Figure 1. QuapDRULA PLIcATA Le Sueuer. 3 natural 
diameter. 
Figure 2. SoMaTOGYRUS INTEGER Say. Enlarged. 
ae 
CARYCHIUM EXIGUUM Say. Enlarged. 
CARYCHIUM EXILE H. C. Lea. Enlarged. 
3 
4 
‘* 5. PLANORBIS EXACUTUS Say. Enlarged. 
6. PLANORBIS DEFLECTUS Say. Enlarged. 
7. PLANORBIS PARVUS Say. Enlarged, 
8. POMATIOPSIS CINCINNATIENSIS Anth. j' En- 
larged. 
‘« 9. POoMATIOPSIS CINCINNATIENSIS Anth. @Q En- 
larged. 4 
‘* 10. CrncINNATIA OBTUSA Lea. Enlarged. 
‘* 11. ByYTHINELLA NICKLINIANA Lea. Enlarged. 
‘* 12. AmnicoLa Lustrica Pilsbry. Enlarged. 
‘* 13. Amnicota Limosa Say. Enlarged. 
** 14. CINCINNATIA CINCINNATIENSIS Lea. Enlarged. 
Numbers 2 to 14 are photographs of camera lucida draw- 
ings, by the author. 
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