Plate L Continued. 



PAGE. 



Fig. 4. FENESTELLA TEISEBIALIS Ulr 541 



4. Obverse face of an example in a fairly good state of preservation. x9. The 



long tubular spines which are now known to have been present be- 

 tween the aperturas of each range, were broken away in freeing the 

 specimen from the shaly matrix. 



4 a. Thin section showing structure of frond at different levels, x!8. At the 



lower left hand corner the black spot represent the bases of the 

 tubular spines. 



Fig. 5. FENESTELLA SEKEATULA Ulr 544 



5. Obverse face of a perfect fragment, x9. 



5 a. Portion of flg. 5, x!8. showing as usual three cell apertures to the fenes- 



trule. 



5 b. Reverse aspect of same specimen, x9. In other examples the dissepi- 

 ments are somewhat stronger and the fenestrules a little wider. 



5 c. Profile view of a branch to show the serrate appearance of the carina. 

 Warsaw beds, Warsaw, III. 

 Illinois State Museum. 





: 'i: ii . 

 RU ni dl -in!, 



