PLATE 66. 



1 - 15. 669. 1. BUMASTIS BARRIENSIS. ( Pag. 302.) 



1 & 2. Young specimens of this trilobite 



8 & 4. Larger specimens of Ihe s.imc, showing sliglitly 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 large individual preserving its natural proportions. 



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

 9. An unusually large ccplialic shield, preserving the cheeks wjiich arc somewhat distorted. 

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



12. A part of the caudal shield and two articulations enlarged, showing the lamellar stria; 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 where the crust is broken off around the margin, and above this the 

 punctate surface, which sometimes marks well preserved casts. 

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



