Atrypae of the Central Missouri Devonian 53 
ig! BO Gg 
SU Re ee eo el 
Figs. 1—5 Atrypa snyderensis spec. nov. 
1. Pedicle view of a very perfect shell. 2. Pedicle view of a 
young shell. 3. Brachial view of a young shell. 4. Brachial view 
of a very young example, enlarged. 5. Pedicle view of a large 
€xample with the shell removed except the marginal varice. 
