Batmond. — New and Old Silurian Trilobites. 



PLATE 3. 



All figures natural size. 



1,2. Trochurus nasutus (WeUer) Dorsal and side views of a cranidium from 

 the Niagaran at Wauwatosa, Wise. M. C. Z. 632. 



3. Ceratocephala goniata Warder. Mould of the exterior of a pygidium. 



From the Racine dolomite, Racine, Wise. M. C. Z. 633. 



4. The same species. A fragment of a thorax. Racine, Wise. M.C. Z. 



634. 



5. The same species. A natural cast of the central part of a pygidium. 



Racine, Wise. M. C. Z. 635. 



6. Cheirurus welleri Raymond. A cephalon and parts of five thoracic 



segments. Wauwatosa, Wise. M. C. Z. 630. 

 7, 8. Encrinurus reflexus Raymond. Dorsal view of one, and profile view of 

 the other of the cotypes. From the Niagaran at Wauwatosa, Wise. 

 M. C. Z. 636, 637. 

 9, 10. 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. 

 11. Calymene breviceps Raymond. An entire specimen from the Waldron 

 shale (Silurian), at Waldron, Indiana. Holotype. M. C. Z. 640. 



