Raymond. — New and Old Silurian Trilobites. 



PLATE 1. 

 All figures natural size. 



1. Bumastus decipiens Raymond. A specimen lacking the free cheeks and 



with the posterior portion of the pygidium incomplete. Niagaran 

 at Wauwatosa, Wise. M. C. Z. 641. 



2. The same species. Side view of the holot>'pe, showing the large eye and 



the absence of lip on the free cheek. Wauwatosa, Wise. M. C. Z. 

 642. 



3. Bumastus niagarensis (Whitfield). An entire specimen. Wauwatosa, 



Wise. M. C. Z 643. 

 4,5. A ctinolobus americanus R&ynioud. Two views of the holotype. From 



the Racine dolomite (Niagaran), Racine, Wise. M. C. Z. 644. 

 6, 7. Bumastus tenuis Raymond. Two cranidia, to show the flattened form 



and the wide concave lip. Wauwatosa, Wise. M. C.Z. 645, 646. 

 8; 9. Bumastus dayi Raymond. Dorsal and side views of the holotype. 



Wauwatosa, Wise. M. C. Z. 647. 



10. The same species. A large cephalon. Wauwatosa, Wise. M. C.Z. 648. 



11. Bumastus tenuis ? Raymond. A pygidium referred with doubt to this 



species. Wauwatosa, Wise. M. C. Z. 649. 



