402 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 65 



PAGE 



Saukia lodensis (Whitfield) 379 



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

 stone. Plaster cast. U. S. National Museum, Catalogue 

 No. 58618. Original specimen in collection of Edgar E. 

 Teller, Milwaukee, Wis. 



2. (X 3-) Small cranidium with strong tubercles. U. S. National 



Museum, Catalogue No. 58619. 



3. (Natural size.) Matrix of a dorsal shield flattened in shaly 



sandstone. Plaster cast. U S. National Museum, Cata- 

 logue No. 58620. Original specimen in collection of Edgar 

 E. Teller, Milwaukee, Wis. 

 The specimens represented by figs. 1-3 are from locality 85, 



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



County, Wisconsin. 



Dikelocephalus texanus Walcott 372 



Fig. 4. (Natural size.) Portion of cranidium in limestone. From 

 locality 70a, Upper Cambrian : Wilberns formation ; Baldy 

 Mountain, near Morgans Creek, Burnet, Burnet County, 

 Texas. U. S. National Museum, Catalogue No. 58621. 



Dikelocephalus ? limbatus Hall 369 



Fig. 5. (Enlarged one-third.) Type specimen of cranidium of species. 

 (78b.) U. S. National Museum, Catalogue No. 58622. 



6. (Natural size.) Cranidium from a different layer but at about 



the same horizon in the section. (78.) U. S. National 

 Museum, Catalogue No. 58623. 



7. (Natural size.) Fragmentary pygidium associated with the 



cranidium represented by fig. 6. (78.) U. S. National 



Museum, Catalogue No. 58624. 

 The specimens represented by figs. 6 and 7 are from localities 

 78 and 78b, Upper Cambrian : St. Lawrence formation, quarry near 

 St. Croix River, in suburbs of Osceola, Polk County, Wisconsin. 



8. (X 2.) Pygidium of the same general type as that of fig. 7. 



From locality 8ib, Upper Cambrian: Jordan ? sandstone, 

 near Devils Lake, Sauk County, Wisconsin. U. S. National 

 Museum, Catalogue No. 58625. 



Saukia crassimarginata (Whitfield) ? (See pis. 61 and 66) 377 



Fig. 9. (Natural size.) Dorsal and side views of a pygidium of the 

 type of that of fig. 5, pi. 66. From locality 8ib, Upper 

 Cambrian : Jordan ? sandstone near Devils Lake, Sauk 

 County, Wisconsin. U. S. National Museum, Catalogue 

 No. 58626. 

 10. (Natural size.) Cast of interior surface of pygidium from 

 locality 83', Upper Cambrian : An upper horizon of the 

 St. Lawrence formation near Trempealeau, Trempealeau 

 County, Wisconsin. This has the general character of the 

 specimen represented by fig. 9. U. S. National Museum, 

 Catalogue No. 58627. 



