Raymonv.— New and Old Silurian Trilobites. 
1, 2. 
9, 10. 
it 
PLATE 3. 
All figures natural size. 
Trochurus nasutus (Weller). Dorsal and side views of a cranidium from 
the Niagaran at Wauwatosa, Wisc. M. C. Z. 632. 
Ceratocephala goniata Warder. Mould of the exterior of a pygidium. 
From the Racine dolomite, Racine, Wisc. M. C. Z. 633. 
The same species. A fragment of a thorax. Racine, Wisc. M.C. Z. 
634. 
The same species. A natural cast of the central part of a pygidium. 
Racine, Wisc. M. C. Z. 635. 
Cheirurus welleri Raymond. A cephalon and parts of five thoracic 
segments. Wauwatosa, Wisc. M. C. Z. 630. 
Encrinurus reflecus Raymond. Dorsal view of one, and profile view of 
the other of the cotypes. From the Niagaran at Wauwatosa, Wisc. 
M. C. Z. 636, 637. 
Calymene celebra Raymond. The cephalon of one entire specimen and 
the pygidium of another, the two specimens being the cotypes of the 
species. From the Niagaran at Grafton, Illinois. M.C. Z. 638, 639. 
Calymene breviceps Raymond. An entire specimen from the Waldron 
shale (Silurian), at Waldron, Indiana. Holotype. M. C. Z. 640. 
