PLATE VI 



I. Euomphalus winoncnsisn. sp. Upper surface of a fragment reconstructed 

 from other specimens. , 



2 and 3. Cvrtoceras winonicum n. sp. Fragments of two shells preserved 

 as interior casts. The last has a part of the chamber of habitation at- 

 tached. 



4. Cyrtoceras dresbachense n. sp. 



5, 6 and 7. Piloceras corniculum n. sp. (5) Specimen, drawn with the 



concavity of the last septum indioattd in dotted lines. (6) Another 

 specimen and (7) cross section of the same. 

 8, 9 and 10. Ascoceras gibberosum n. sp. Side view of the septate portion 

 as an internal cast, and (9) longitudinal and (10) transverse sections 

 of the same. 



II. Endoceras consuetum n. sp. 



12. Lingala dolata n. sp. 



13. Receptaculites-l\ke strncture from the Shakopee. 



14. Suhulites exactus n. sp. 



