Plate LII Continued. 



PAGE. 



Fig. 7. FENESTELLA MIMICA Ulr 552 



7. Portion of a specimen showing the obverse side. x9. 



7 n. Several branches of same, x!8, for comparison with fig. 6. 



Lower Coal Measures. Seville, 111. 

 Illinois State Museum. 



Fig. 8. FBNESTEIXA CONBADI Ulr 553 



8. Obverse face of average specimen, x9. The flattened elevations on the 



keel should be more conspicuous. 



8 . Shows the appearance of the reverse of same,x9. 



Upper Coal Measure, Bed Oak, Iowa. 

 E. O. Ulrich's collection. 



Fig. 9. FENESTELLA IN^QUALIS Ulr. (See also PI. LIV.) '54 



9. An example showing the characters of the obverse face, x3. 

 3 a. Beverse side, x!t, showing the distinct granular strise. 



,. Upper Coal Measure, Sangamon Co., III. 

 Illinois State Museum. 



.Six .< 



- 

 .eio<[ alunlni V) wir 





