J. W. Dawson—Paleozoie Land Snails. 407 
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Fig. 1, Pupa vetusta, magnified 8 times lineally ; 2, same, showing the aperture, 
x 8; 3, same, nuclear whorl, x 25; 4, same, mature egg and embryo shell, x 25, 
5, 6, Pupa Bigsbii, x , Pupa Vermilionensis, x8; 8, same, showing aper- 
ture x8, the small tooth on the columella somewhat exaggerated; 9, same, 
section of aperture, showing tooth x16. 10, Zonites priscus, x8; 11, same, 
crushed specimen, showing aperture x 20. 
