Raymonp.— New and Old Silurian Trilobites. 
PLATE 1. 
All figures natural size. 
Bumastus decipiens Raymond. A specimen lacking the free cheeks and 
with the posterior porticn of the pygidium incomplete. Niagaran 
at Wauwatosa, Wisc. M. C. Z. 641. 
The same species. Side view of the holotype, showing the large eye and 
the absence of lip on the free cheek. Wauwatosa, Wisc. M. C. Z. 
642. 
Bumastus niagarensis (Whitfield). An entire specimen. Wauwatosa, 
Wisc. M.C. Z. 643. 
Actinolobus americanus Raymond. ‘Two views of the holotype. From 
the Racine dolomite (Niagaran), Racine, Wisc. M. C. Z. 644. 
Bumastus tenuis Raymond. Two cranidia, to show the flattened form 
and the wide concave lip. Wauwatosa, Wisc. M. C. Z. 645, 646. 
Bumastus dayi Raymond. Dorsal and side views of the holotype. 
Wauwatosa, Wisc. M. C. Z. 647. 
The same species. A large cephalon. Wauwatosa, Wisc. M.C. Z.648. 
Bumastus tenuis ? Raymond. A pygidium referred with doubt to this 
species. Wauwatosa, Wisc. M. C. Z. 649. 
