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NEW YORK STATE MUSEUM 

 PLATE 10 



Poleumita (?) sulcata Hall (sp.) 



Page 62 



FIG. 



i, 2 Two views of a typical specimen. Natural size 

 3, 4 Profile and umbilical views of another specimen. Natural size. 

 Rochester (Arey collection) 



Trochonema cf. fatuum Hall 



Page ^s 



5 Lateral view of the only specimen observed. Natural size. 



Upper Shelby bed (N. Y. State Museum) 



Lophospira bispiralis Hall (sp.) 



Page 71 



6 Apical part of a specimen, showing distinctly the carinae. 



From a gutta-percha impression of a natural mold. X2. 

 Lower Shelby bed (N. Y. State Museum) 



7, 8 Two older individuals which show the structure of the slit 

 band and the gradual obsolescence of the carina on the 

 upper side of the volution. Natural size. Rochester 



