Plate LVII Continued. 



PAGE. 



Fig. 5. HEMITBTPA PBOUTANA var. VEBMIFEBA Ulr 561 



5. Small portion, natural size, of a large specimen, showing the vermiform 



tubes on the reverse side of the zoarium. 



5 a. Portion of same, x9, show ng several of the tubular bodies 



Warsaw beds, Warsaw, 111. 

 Illinois State Museum. 



Fig. 6. HEMITBYPA PEBSTBIATA Ulr 564 



6. Reverse aspect of a specimen, x9, showing the relative size of the branches 



and fenestrules, the depressed d ssepiments and the strong striae and 

 spines. The latter are often stronger than here represented. 



6 a. This section showing structure of zoarium at different levels, x!8. 



Keokuk group, Bentonsport, Iowa. 

 Illinois State Museum. 



Pig. 7. HEMITBYPA PATEBIFOBMIS Ulr S64 



7. Natural size view of specimen. 



7 a. Obverse or upper face, x9, showing character of superficial net- work. 



7 6. Portion of the non-celluliferous or lower side of eame about midwar 



between the base and outer margin, x9. 

 7 o. Thin faction showing structure of zoarium at different levels, x!8. 



Keokuk group, Keokuk. Iowa. 



E. O. Uli ion's collection. 



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fMd'iriHiii 'j(t [(' it. >i..-ii: [)' i-iif-* boml iiV- 

 -vrfl -.-onwo -{oiii xntui iwlto BO .x .Htiiim 



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