PLATE 66. 



<'ig. 1 - 15. 669. 1. BuMASTis barriensis. { Pag. 802.) 



1 & 2. Young specimens of this trilobite 



8 & 4. Larger specimens of the same, showing slightly different proportions. 



5. A larger individual where the articulations of the body are closely pressed together, and the cephalic 



shield slightly overlapping the upper edge. 



6. A largo individual preserving its natural proportions. 



7 & 8. The central portions of the ceplialic shield as they occur in the shale, entirely flattened. 

 9. An unusually large ceplialic shield, preserving the checks which are somewhat distorted. 

 10 & 11. The cheek with a part of the eye attached, and the same enlarged. 



12. A. part of the caudal shield and two articulations enlarged, showing tlie lamellar strije with intermediate 



granular surface. 



13. A portion of another caudal shield of another specimen, preserving the punctate crust in one part, 



showing the striated surface wliere tlie crust is broken off around the margin, and above this the 

 punctate surface, wliich sometimes marks well preserved casts. 

 14 85 15. Enlargements of the punctate surface of the shell and cast of this fossil. 



