404 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 66 



PAGE 



Dikclocephahis miiniesotciisis Owen. (See pis. 60, 61 and 62) 369 



Fig. I. (Natural size.) Matrix of free cheeks and frontal margin. 

 From locality 113, Upper Cambrian: St. Lawrence forma- 

 tion at La Grange Mountain (or Barn Blufif), near Red 

 Wing, Goodhue County, Minnesota. Plaster cast. U S. 

 National Museum, Catalogue No. 58612. Original speci- 

 men in collection of Edgar E. Teller, Milwaukee, Wisconsin. 



Saiikia crassimarginata (Whitfield). (See pis. 61 and 65) ^77 



Fig. 2. (Natural size.) Entire dorsal shield flattened in shaly sand- 

 stone. U. S. National Museum, Catalogue No. 58613. 



3. (Natural size.) Free cheek. U. S. National Museum, Cata- 



logue No. 58614. 



4. (Natural size.) Cranidium. U. S. National Museum, Cata- 



logue No. 58615. 



5 and 5a. (Natural size.) Top and side views of a slightly flat- 

 tened pygidium. U. S. National Museum, Catalogue 

 No. 58616. 

 The specimens represented by figs. 2-5 are from locality 85, 



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



County, Wisconsin. 



