392 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 60 



PAGE 



Dikelocephalus minnesotensis Owen. (See pis. 61, 62, and 66) 369 



Fig. I. (Natural size.) Cranidium flattened in shaly sandstone. (85.) 

 U. S. National Museum, Catalogue No. 58594. 



2. (Natural size.) Impression of outer surface of free cheek. 



(113.) U. S. National Museum, Catalogue No. 58595. 



3. (One-half natural size.) Thoracic segment flattened in shaly 



sandstone. (85.) U. S. National Museum, Catalogue 

 No. 58596. 



4. (One-half natural size.) Segment from shaly sandstone. From 



locality 85X, Upper Cambrian : St. Lawrence formation 

 near Mazomanie, Dane County, Wisconsin. U. S. National 

 Museum, Catalogue No. 58597. 



5. (One-half natural size.) Free cheek in shaly sandstone. (85.) 



U. S. National Museum, Catalogue No. 58598. 

 The specimens represented by figs, i, 3, and 5 are from locality 

 85, Upper Cambrian : St. Lawrence formation at Prairie du Sac, 

 Sauk County, Wisconsin. 



6. (Natural size.) Pygidium flattened in shaly sandstone. (113.) 



U. S. National Museum, Catalogue No. 58599. 

 The specimens represented by figs. 2 and 6 are from locality 113, 

 Upper Cambrian : St Lawrence formation at La Grange Mountain 

 (or Barn Bluff), near Red Wing, Goodhue County, Minnesota. 



7. (One-half natural size.) Pygidium preserving considerable of 



its natural convexity. From locality 86, Upper Cambrian: 

 St. Lawrence formation at Van Ness quarry, Gibraltar 

 Bluff, Lodi, Columbia County, Wisconsin. U. S. National 

 Museum, Catalogue No. 58600. 



8. (X 3-) Cephalon of young individual with very broad frontal 



hmb. From locality 83^ Upper Cambrian: An upper 

 horizon of the St. Lawrence formation near Trempealeau, 

 Trem^pealeau County, Wisconsin. U. S. National Museum, 

 Catalogue No. 58601. 



